Blade and Soul has a better engine and more fluidity - don’t play it if you want to be competitive at anything though, due it’s F2P model it’s pretty heavily p2w and getting into it’s pvp scene is a literal nightmare. Full of exploits/clever use of game mechanics, clipping, and many years of experience. Visually I found it to be far superior to FF14 and overall more enjoyable until I got to endgame which petered out really fast.
FF14 has one of the best crafting/gathering systems of any game I’ve played, and I’ve played alooot of games, visually stunning but ruined by horrible engine/clunky movement, half the textures aren’t real, there’s delays and clipping abound (eg in WoW, aoe goes off in red circle, if you’re out of the circle when it goes off, you’re fine, in FF14 you need to be out a bit sooner, awkward adjustment) the terrain and movement is weird (alot of invisible walls, flying is gross, can’t fly over chasms/mountains/etc, doesn’t feel nearly as open) also the story in FF14 is a MAJOR hit or miss. It is incredibly long, and didn’t make much sense to me, and you have to do all of it to unlock content, I hated it so much I just skipped over it. Others love the story, up to you. It’s pve is neat, but the pvp basically doesn’t exist. Minecraft has better pvp.
Blade and Soul for 1-3 months of enjoyable time, beautiful scenery, animations, classes, and gameplay before the f2p asian grind takes over.
FF14 for 6-8 months of content(this was at 40ish hours a week, before the recent expansion, so probably more now), tons of classes and jobs, all of which can be played on one character (your race is cosmetic, you start with one class and unlock all of them, can change classes out of combat at will, levelings kinda slow but I honestly loved the leveling, going through the zones, clearing the side quests and the content was enjoyable, it was just the main story throttling that got me. Lack of pvp was minor, endgame raiding was really challenging, dps across all classes is pretty even, almost boringly so - there’s no op carry mode or anything, healers are expected to dps. The only reason I’m not still playing ff14 tbh is because the recent expansion made alot of changes I didn’t like (removed alot of the “skillcap” type abilities, dumbed down most classes and butchered my main class, Astro)
Overall I’d say blade and soul for temporary lulz and ff14 for long term lulz