So BACk to the OT lol, like Haxx said, warriors arent in a real good spot right now ( I havent looked at 5.4 notes for them) But elem if played right can be really good. But, even if you're not "great" at playing elem it's still fun, just the playstyle if fun to me. But for your 2 choice i would stick with elem...And, if you're just going to be playing for fun and not trying to get 2200+ rankings or anything, either one works fine if you're ejoying them.
Warriors aren't going to be much better come 5.4. We are getting some nice quality of life changes, but overall it's not going to make us godless killing machines like earlier this expansion. We'll have slightly more uptime and it will be easier to play. Maybe the slight boost to sustained pressure will be enough to push us into middle of the pack. I'd be content with that.
Warriors will still be bad in 5.4. No real changes that affect single target damage which you need in PVP. Slam hitting more then one target for whatever damage is pretty much going to be worthless in arena and RBG's since the range is a laughable 2 yards.