Left field... Firefox beta
Used to be diehard dolphin fan but I have recently switch to firefox beta.
1. Its got flash support even on jellybean
2. Lastpass extension, how do people live without this on touch devices?
3. It renders better than webkit on the sites I go on, even the google+ site has issues on webkit based browser (inc chrome).
4. Decent desktop sync
5. With recent ionmonkey builds its only marginally slower than chrome/dolphin.
EDIT, Infact I just ran sunspider on my nexus 4:
firefox beta = 1775.7
Chrome = 1895.8
To my surprise it seems firefox is actually faster these days, ionmonkey obviously dong its job :/