The BIGGEST advantage with FF14 over WoW is that 14 is alt class friendly. You literally level every available battle class (job as it’s called) and even every gathering/crafting profession on 1 character. This means you only do the story quest once and any OPTIONAL faction grind once.
Also you can play your main class (White Mage in my case) and get gear for all your other classes.
Another aspect I like about the game sync system. You could be max level but go in a low level dungeon with a friend and allow them to experience that dungeon how it’s meant to be at it’s level. Your max level class is scaled down and even your spells are removed down to that dungeon level. If the dungeon is level 35 then you can’t use any abilities/spells that you get past level 38. You get scaled down to 3 levels over the dungeon level.
Flying is also done right. You can fly in every zone once you finish 2 things. 1. The main story in that zone and 2. after you gather all the Aether Currents in the zone. This just involves exploring the entire zone and picking up the currents.