FFXIV is awesome. The story of the expansions are easily as good if not better than any single-player RPGs. (And I hear the story got even better in Shadowbringers.) On the casual level there are a large variety of things to do at end game. The class and profession system let you do everything on one character which is great because it makes you more attached to your main. There is housing, the transmog is really good, you have the FFVII Gold Saucer, game controller support, the music is bloody fantastic, etc.
The reason I returned to WoW is because I play MMOs for the social and I dearly missed my guild with whom I raided for over 10 years, and also because I wanted to see the end of Legion before Blizzard breaks our artifact weapons. If it wasn’t for that, I would never have returned to WoW, save maybe to level a toon to 60 in classic. (But then I’d quit again, grinding The Molten Core at classic end-game is out of the question for me.)
There are things WoW definitely does better than FF though.
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The raids are much better for one thing. Between having only 4 bosses per tier without any trash, the rather slow server tick, and some random meta nonsense like healers being told to worry more about their DPS parse than their healing parse, it’s difficult to see any hardcore raider opting for FFXIV over WoW, unless they consistently fail to fill a 20-man group.
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PvP is the other obvious thing WoW does better. PvP in FF is more or less a mini-game where you get a baby version of your skill set that is specifically designed for PvP and that is not impacted by gear. In WoW, PvP is not a second class activity. One could argue that sacrificing PvP allowed their PvE to be really good, but PvP is important to a lot of people and that can be an absolute deal breaker. (Although to my experience, serious MMO PvPers prefer action combat MMOs like BDO or GW2.)
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WoW’s game engine is a lot better. Seamless zones since WoW 1.0, much faster server tick, no random limitations like not being able to send whispers to people in instances or not being able to equip things while talking to a vendor, support for UI addons, etc. The account and server system is also garbage in FF. You can’t even create a character on a congested server even though your friends may play on one such server. (/feelsbadman if your SO plays on Aether…)
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Probably the most important: the low-level experience is also a lot better in WoW. The quests in FF are usually not interesting in themselves (they’re usually fetch quests and go-talk-to-that-dude types of quests) the reason they’re fun is the story that is told by them, but the story is slow and awfully paced before the first expansion and it can really feel like a chore at times. On the other hand, the post-Cataclysm zones in WoW have small and self-contained storylines and are therefore much better paced than the beginning of FFXIV.
None of those really stopped me from enjoying XIV, but you definitely want to consider those if you’re thinking of making the switch.