There's no best, just what you need most.
Small games with Ads/IAPs = CocoonJS
Bigger games as paid app = Crosswalk
Hopefully very soon, bigger games with Ads/IAP = Crosswalk!
Working state is good in my own experience, but I take great care as I build the game to frequently test it on mobile devices, and always check my code to ensure they aren't taking too much CPU.
Highly recommend C2 for Android Apps.
I only have a few games (recently launched) so far:
But I like C2 a lot.