I've made a pretty comprehensive WoW vs FFXIV comparison here.
Personally, if you don't like playing through JRPGs for their story, you're just not going to find as much fun in FFXIV as you would in WoW. Outside of the story, FFXIV has little "gamey" content. I guess there's content... if you like relic grinds.
When it comes to the "gamey" content, WoW does everything better. Or, it used to. Better reputations and waaay more of them, better dailies and waaay more than them, more ways to reshape your character through transmog and waaaay more transmogs to farm for, far more content, amazing raid presentation, etc.
Personally, I switched from WoW to FFXIV because 1. I did all of the content in WoW I was interested in (after MoP the quality of their "gamey" content dropped hard, but I digress), and 2. I didn't have as much time to keep playing WoW anymore. FFXIV doesn't have the sheer amount of content WoW has, but it has high quality story content. Outside of that, logging in once a week to raid (which is just queuing onto on a boss platform, not a fully fleshed out instance like in WoW) with my FC for a few hours is enough for me. Also like doing stuff in the Gold Saucer (FFXIV's minigame casino), like racing and triple triad and jumping puzzles and mahjong.