I like the variety. In ESO, which I do also enjoy, the lore and questing are great but despite a huge open world the very limited number of activities and design of the reward system make the game itself feel small in comparison to FFXIV. Housing is better in ESO, even as the owner of a medium home on a desirable/popular plot location, I'll give it that.

I like playing different jobs on the same character, something I also enjoyed about FFXI, and the in-depth configuration tools that let me set everything up "just right".

Overall, FFXIV offers more to do and a better designed interface to do it with than the (admittedly small number) of other MMOs I've played. Stand alone crafting and gathering classes, gold saucer, Eureka, GC squadrons, deep dungeons, and a multitude of other activities and little QOL bonuses.

I'm not a PVP player, never touched it and probably never will, so I like having that separate.