what is so bad about samsung?
unstable firmware?
S II - G version - extremely unstable at earlier stage, I use probably less than a month, sold it. My colleague still using it, much stable now but still occasionally hang from time to time.
S III - Quite stable but the international edition 1GB RAM cannot proper run it own touchwiz launcher, keep auto reload launcher after long use.
Nexus 10 - another nightmare, extreme not stable at earlier stage during 4.2.1, hang everyday, after update to latest 4.2.2, better, but still need restart every usage of 4 to 5 days due to RAM issue, as extra 800MB get occupied for GPU usage when updating to 4.2.2 which make the device became like 1GB RAM rather than 2GB. I know Nexus 10 is Google device but it also manufacture by Samsung.
My 1st sister use Samsung Galaxy Note II, she said sometimes also hang and she regret buy it, she told me this is her first and last Samsung phone.
My 3rd sister previously use Samsung Galaxy W, the spec look higher than first Google HTC Nexus One, but it actually run really bad on stock especially gaming, custom AOKP do make the phone run better but still not good. Last two weeks she also change to Sony Xperia ZL, and she is extreme happy now as the phone is smooth and solid stable.
Now I using Sony Xperia Z, never face hang issue at all, and it run smooth, even better now in 4.2.2
I also purchase Sony Xperia Tablet Z recently, already 3 days usage, stable and smooth. Never hang also.
With current Sony product, I can proudly said I can run Sony stock look happily without need of switching to AOSP/AOKP/CM like what I did previously when using Samsung.