FFXIV mechanics are essentially copy & paste from WOW. So if you hate WOW for it's game "mechanics" but love FFXIV, then there is something seriously wrong with you.
Mainly directed at the second poster on this thread and anyone who actually clicked "like".
However, WOW is a much smoother game as far as gameplay goes.
1 There is no sliding when you initiate an attack.
2 There is no animation locks.
3 Instant cast abilities are truly instant and not affected by animation nor global cooldowns.
4 Little to no latency issues due to server optimization/locations (Low ping/ms).
Adding to the fourth bullet point: WOW's server architecture is also client based. Not server based.
So in WOW's case, response to your movement when dodging red circles/danger zones is far, far more responsive. (Ever get hit by silly things, like say, Titan's Landslide, even though you obviously dodged on your screen? That doesn't happen in WOW).
Finally, WOW class mechanics are "mostly" unique. Every class can truly talent/spec out into different paths. Making your class a little bit more unique.
This obviously has limitations, but it is far better than what we have in FFXIV. Subjective opinion, of course (My opinion).
Mechanics aside, the two games are radically different.
Story/world/lore are hundreds of miles apart.
Personally, I love both WOW and FFXIV. But, mechanics wise, WOW is the clear winner.
For reference.
I've played FFXIV since the original release.
I've played WOW since BETA stages in 2004, until Cataclysm. I plan to play again upon release of Warlords of Draenor.