Corrin's choice to smash was a wise one, 'cause he's great!
Just feels perfect for me. I like the longish range on his sword/spear-thingy attacks, his projectile's nice, his recovery isn't terrible, he's strongish, his counter's quite good, and that weird stab-the-ground thing's neat too. Up-Smash is odd tho, not sure what it's for.
I really like Corrin.
I like Bayonetta as well. Not as much as Corrin, but she's cool.
She's very combo-oriented tho. And a bit weak, outside of her (admittedly really strong, but rather slow) smashes. Witch Time's f***in' crazy tho, no way that survives as is if this game gets another patch.
She's not as great a fit for me as Corrin (I dunno if it's just that I haven't spent enough time with her or not, but she just feels weird), but I like Bayonetta.
Umbran Clock Tower has Bayonetta music. It's awesome.
All in all, I really, really like the last Sm4sh DLC.