Reliabilty would depend on individuals?
Have been with Transtar for more than 10 years over 40-50 times and there only 1 breakdown?
Just to clarify, I'm not trying to say either one is better over the other. I've taken both Transtar and 707 and so far both haven't let me down. One thing I like about Transtar is that they offer trips to KL area, while 707 only goes straight to Genting and also solely departs from there, but from past experience both are reliable in the service that they provide. On my uphill trips, I like to stop in KL first and do some shopping and makan before heading uphill, so I need to take Transtar which is the only reliable service to KL. I will only take 707/Transtar/5-Star from uphill back to SG because these are the coaches that are safe, relatively fast and trustworthy.
Hope this helps anyone searching for good coaches to take to/fro KL/Genting.