needing opinions

[OfRa]

I've been playing kfm and bm but not feeling them too much so i made a fm so far lvl 3. In terms of "fun" and open world pvp, how do all three of those classes stack? The one other class i am considering is assassin, but i haven't made one yet. Any advice/opinions are welcomed. 

[OfRa]

Also if you have any knowledge about them at lvl 50 please share!