TWEWY was wonderful, but sincerely, it was a lot more repetitive than what days could ever be.
Days added some depth to Roxas and i think they dealt with Xion in an interesting way (though, as someone said before, she's the definition of "Plot Device"). It's an awkward game, specially at the beginning, but it's worth for that ending.
And the" 3 friends" thing, it's weak, but hey, these are 3 "Hollow" humans on weird dark coats that use keys and are part of this weird clan full of douches. If i'd wake up as a (13)? year old, with no memories and i get named by this useless and deep voiced man that puts me to work for him in a pale castle i'll be as obnoxious (or even more) as Roxas and Xion. So that kinda explains it.
I don't know, after all, the story just worked. I thought replaying it would kill it for me, but it didn't. And that Scene with Xion and Axel in front of Naminé's hiding spot is glorious.