Which electric toothbrush is better? Oral B or Sonicare? I did a search on Google and see a lot of recommendations for Sonicare. Wonder if there’s any research done that has direct comparison for electric toothbrush performance.
		
		
	 
Found the info that i posted earlier.
Note - it's what i can google and find on NCBI.  I can't help it if the dentists are biased due to sponsorship etc.  You are probably fine if you have either Oral B or Philips sonicare, it's more of a first world problem than anything and boils down to product and brushhead replacement prices.
Ultimately, my experience and view is that if one's skill and brushing method is just shoddy all the way to normal, you can benefit from using an electric.
If you are pro and very merticulous in manual brushing, you might not find that much of a difference between electric and manual.
And finally, if you are the type in which electric suits you and you go for say Oral B line-up (go for the 3D range, having both oscillations and pulsations actions), then those minor differerences like Oral B 3000 with 20,000 oscillations/min and 40,000 pulsations/min   vs lower range models having 20,000 oscillations and 20,000 pul/min don't make that much of a difference.  
ie If you have the budget, then power to you go ahead......but if you are aiming for the best value, go for those having 20,000 osc/min and 20,000 pul/min is absolutely fine, very minimal differences that aren't worth pursuing.....spend the money towards water flossing as well (very recommended, will make a much much bigger difference in oral hygiene). 
Oral B vs Sonicare, which is better?
I think it's nearly a toss up with a slight lean towards Oral B.  
Edit - It's really leaning towards Oral B now....
Stuff like duration of brushing and technique matters significantly.
BTW these researches often do not differentiate/declare whether Oral B or Sonicare is the sponsor.  
 
This study on NCBI says Oral B
https://www.ncbi.nlm.nih.gov/pubmed/24282870
CONCLUSION:
An advanced oscillating-rotating power toothbrush produced substantial, statistically superior reductions in plaque and gingivitis via multiple outcome measures compared to a new sonic toothbrush after both four weeks and 12 weeks of tooth brushing.
This study on NCBI says Sonicare
https://www.ncbi.nlm.nih.gov/pubmed/9487838
Conclusion : Overall, this study demonstrates that long-term use of these two electric toothbrushes improves periodontal health in adult periodontitis patients, and that the Sonicare brush is superior to the Braun brush in reducing gingival inflammation and probing depth. Moreover, 6 months' use of Sonicare led to actual improvement in probing attachment levels of periodontal pockets.
This study a bit undecided between the 2  
 https://www.ncbi.nlm.nih.gov/pubmed/15633499
https://www.ncbi.nlm.nih.gov/pubmed/15633499
 Data revealed that the oscillating/rotating toothbrush was more effective than the Sonicare toothbrushes with respect to plaque removal. It is possible that factors associated with the clinical situation such as damping resulting from bristle contact with the tooth surface and the high viscosity of saliva and dentifrice may counteract dynamic fluid activity in vivo. This review indicates that dynamic fluid activity beyond the reach of bristles as demonstrated in the laboratory is yet unproven in the clinical situation.
This study says Oral B
https://www.ncbi.nlm.nih.gov/pubmed/15997965
CONCLUSION:
Based on the findings of this single-use clinical evaluation, the action of the oscillating/ pulsating power toothbrush is more effective at plaque removal than a high frequency power toothbrush.
This study says Oral B
https://www.ncbi.nlm.nih.gov/pubmed/16208801
An oscillating/pulsating electric toothbrush versus a high-frequency electric toothbrush in the treatment of gingivitis.
CONCLUSIONS:
The oscillating/pulsating power toothbrush (Oral-B ProfessionalCare 7000) was more effective than the high-frequency power toothbrush (Philips Sonicare Elite) at plaque removal and improvement of gingival condition, with no greater potential for causing gingival abrasion.
This study says Oral B
https://www.ncbi.nlm.nih.gov/pubmed/9823079
A crossover clinical investigation of the safety and efficacy of a new oscillating/rotating electric toothbrush and a high frequency electric toothbrush.
PURPOSE:
To compare the efficacy on plaque, gingivitis and calculus of an oscillating/rotating power toothbrush (Braun Oral-B Ultra Plaque Remover-D9) and a high frequency toothbrush (sonicare).
RESULTS:
Both toothbrushes were found to be safe and effective, but a significantly lower gingival index (P = 0.002) and a lower calculus index (P = 0.022) was found in the D9 group. Assessment of patient preferences revealed that a significant majority of subjects in the study (65%) preferred the D9 to the high frequency toothbrush (27%). It is concluded that the D9 may offer greater potential for the maintenance of good gingival condition than the high frequency toothbrush, and that the greater preference for the D9 may be important with respect to long-term compliance.
This study says Oral B
https://www.ncbi.nlm.nih.gov/pubmed/12666948
A split-mouth comparison of a three-dimensional-action electric toothbrush and a high-frequency electric toothbrush for reducing plaque and gingivitis.
PURPOSE:
To compare the effectiveness in reducing plaque and gingivitis of an electric toothbrush with three-dimensional (oscillating/rotating/pulsating) brush head action, Braun Oral-B 3D Plaque Remover, and an electric toothbrush with high-frequency vibrating action, Sonicare Plus.
RESULTS:
After 21 days without oral hygiene, mean mandibular plaque and gingivitis scores increased significantly for all subjects. Use of both electric toothbrushes during the treatment phase progressively reduced plaque and gingivitis scores at each successive examination. The Braun toothbrush was significantly more effective than the Sonicare toothbrush in reducing plaque at every examination and gingival bleeding after 4 weeks of brushing. It is concluded that the Braun electric toothbrush with three-dimensional brush head action offers advantages over the Sonicare electric toothbrush with high-frequency vibrating action in terms of plaque control and potential improvement of gingival health following induction of experimental gingivitis.
This study says Oral B
https://www.ncbi.nlm.nih.gov/pubmed/8739175
Comparison of an oscillating/rotating electric toothbrush and a 'sonic' toothbrush in plaque-removing ability. A professional toothbrushing and supervised brushing study.
Abstract
The purpose of the present study was to compare the Braun/Oral-B Plak Control (D7) and Sonicare (S) in their plaque-removing efficacy. For this study, 35 university students (non-dental) were selected. This was a 2-part study. Prior to each appointment, all subjects were asked to abstain from all oral hygiene procedures for at least 24 h. In Part 1, the efficacy of the toothbrush was studied when one of the investigators brushed the teeth of the panellists. In Part 2, the efficacy of toothbrushing was studied after the students had received professional instruction. The available time for the brushing amounted to a total of 2 min per mouth. Dental plaque was evaluated by means of the Silness and Löe plaque index assessed at 6 sites per tooth. Results showed that both in Part 2 and Part 1 the D7 removed significantly more plaque than the S-electric toothbrush. The plaque reduction assessed according to Silness and Löe in Part 1 was for the D7, 1.28 and for the S, 1.12. In Part 2, the reductions were 0.90 and 0.80, respectively. The majority (n = 34) of subjects preferred the D7 over the S. In conclusion, the results of the present study show that the oscillating/rotating toothbrush (Braun/ Oral-B Plak Control) is more effective in plaque removal than the sonic electric toothbrush (Sonicare). In addition, given a choice, the panellists preferred the oscillating/rotating electric toothbrush.