Guild Wars 2 for casual and good PVP
Final Fantasy 14 for the whole experience (endgame is a bit eh tho)
WoW ofcourse, best thing about it is the amount of abilities that you can use compared to other MMO's and it's more "advanced" in terms of PVP
BDO, didn't play it myself but it should be pretty good, but i heard some quests are really tedious
same with TES Online, didn't play it but it should be pretty good.
Or you can wait half a year for new world, but all of them are worth trying, glhf