IF you are more of a casual player that likes the social aspect of an MMO then FFXIV is perfect for that. There are good unique event, collectibles, housing and very nice xmogs.
The FC (guild) housing is a game in itself that members can partake together by helping each other design it and build it up. You even have guild airship you can help build with your fellow guildies. If you get into an active FC that are active in organizing events then the social aspect you are looking for increases tremendously. A lot of active FC organizes casual activities whether to hang out on a beach in the game, open christmas gift inside their guild house with matching santa outfits etc.
Crafting and gathering is also a mini game by itself with a very deep story for each.
But like Sal said for hardcore gear progression WoW is the best. Covenants etc also mixes it up for better or worse lol.
I am hooked on ffxiv again although I will continue playing WoW because I really like to see where SL leads to. I dropped all my alts though and just play this DK now to save time etc.