The thing that put me off WoW is that -and I know this is highly subjective- to me it doesn't feel like a very comfy game world to log into and just vibe in. Maybe that has something to do that I don't have any idea what the plot is... Is there a Scion like adventuring party that you join and get attached to?
Personally I find it easier to "chill" in WoW than in FF14. In WoW, you can be chilling in a city, and then on a whim mount up and fly around a huge scenic world to your favorite spots, and then while you are flying maybe you spot a quest you haven't done before and fly down and get started on a quest chain. Or maybe you spot a pet and go battle it and capture it. Or you spot a treasure and loot it and get a customization for your dragon. Or you suddenly get a world quest to fly through rings or to put on a backpack and do a rock climbing minigame. Etc.
But in FF14, you chill in an isolated city block, and nothing happens there. You have to teleport to enter a zone, which is also isolated, and nothing happens there. And then for things to do with other people, WoW has far and away the largest RP scene in any MMO, so if you join an RP server like Moon Guard for NA or Argent Dawn for EU, there will always be campaigns to join. And you can open up LFG and find RBG groups forming or transmog runs for Dragonflight raids forming, etc. In FF14 you open up party finder, and maybe outside of Endwalker trial mount farms, there is nothing that isn't current hardcore stuff. Except venues. I have heard the experience there varies.
As for characters, yes there are characters to get attached to. I like a lot of the major WoW characters more than most of the Scions. I liked Anduin and Wrathion in the MoP legendary questline. The WoD levelling questline cast. Khadgar was funny in the WoD legendary questline and in Legion's levelcap stuff. But WoW is not a linear JRPG like FF14. You will probably not go through the entirety of WoW's story in order, which actually starts in the WC3 RTS game, and pivotal moments happen outside of the games in out of print books like Lord of the Clans (literally the prologue to WC3 with Thrall escaping from an internment camp, learning from Grom about what the Orcs did, meeting Orgrim, getting appointed Warchief, etc), the Shattering (Thrall appoints Garrosh Warchief, Cairne dies), Before the Storm and A Good War (prologue to BFA), etc. And a lot of the story ingame has been removed like the Battle for the Undercity, the MoP and WoD legendary questlines that told the second half of that expansions' story, the War of Thorns questline that BFA begins with, etc. You kinda had to be there to get into WoW's story. Not saying it is impossible but you just won't get the same experience that we oldtimers had when we were experiencing everything live.
With the way WoW currently works, is that you are going to create a character, get through the 1 through 10 starting zone (try to pick anything that is not Exile's Reach), and then you go through some old expansion until you hit level 50/60/70/whatever, and then you are told to stop doing that expansion and start doing the current expansion story which is where everybody is at. The story experience is incredibly bifurcated.
If you want a really social MMO, you are going to want to play an old school MMO private server, like FF11 Horizon or an SWG server or something.