4.3 ROM for Galaxy S2

[VIRGIN KLM]

As I told you, it's alot more stable and fluid and everything else in general is the same (power consumption etc), I'd go with 4.1 since it's stock based that means that most of the times it will have zero bugs too. If you don't care about Touchwiz, there is AOSP/CM 10.2 (4.3) on Galaxy S2 though and CM10.2 actualy has official nightly builds (official means that they are from CM devs themselfs which is a good thing) which are super stable. If you want Touchwiz go with official/official based 4.1, trust me you are missing nothing from 4.2.x+ and there's generaly a nice performance bump from 4.0.x.