Currently in WOW what class should i PVP with?

so im between a rogue, hunter, shaman, druid, and warrior. my problem is that i have trouble sticking to a class because when i pick one i always think another is op and switch to that. so i would like one that is pretty easy to use in pvp and wont be underpowered. i enjoy mele more than ranged with acception to the hunter because they dont cast much. i dont want any answeres like "any class is good in pvp" i want your opinion on wich of these is the best/ the one i will have most success with.