First I played FF1-13 before (exluding 10x2 and 11) and there are times when I just get super nostalgic.
Second the story/campaign of FF14 is so much better in its narrative - if you get to 50 you are in. And you will not look back ever again. Loose zone-campaigns don't exist here. Also if you just play the story as first timer and ignore all side quests you will do your leveling "on the side".
Third Weekly Agends & Palace of the dead - wonderful repeatable leveling options. Bigly.
The only thing that turns me off roughly the same as in WoW but less "effective". Like mass pulling in dungeons - in this game you will laugh at these overconfident people a lot more than in WoW. Also - the fights get harder and harder even in the "campaign". Whenever you meet a new primae/new expansion you will realize: They get harder! I just did Susan o and hell - you need to know what's going on here. People are more lenient but there will always be that flamer. So you need to get your shit together. I don't use damage app, so its rather random besides on clear mechanic fails why the fight isn't going smooth. It's "optimize your play and you will get more insight".
On the other side... I don't dare to continue campaign big primal fights when I quest. It's not LFR and imo at least same than normal mode in WoW currently. What restricts me to continue now and then :P Also as someone new: FF14 has still the mentality "get a fc/guild and they will be more friendly to you than random people". It helps a lot and the people help a lot. Much better community overall imo.