Assassin's Creed: Brotherhood vs 2

I liked AC2 more, but Brotherhood was very good too,

I agree, Revelations was by far the worst and most boring imo, Maybe Brotherhood

Brotherhood of course , also it have multiplayer

I liked Brotherhood more but I urge you to play all of them starting from the first one. It's best to keep continuity.

To be fair out of those choices i personally prefer brotherhood because of its multiplayer (characters etc...), but to be fair i like black flag because it adds new things in and i enjoyed being a pirate, ive got 2 assassin creed pirates on my ipad as well xD