I just upgraded from an original SE to the iPhone 13 mini, because I like phones designed for use with one hand. The regular-sized 12/13/14 is just a touch bigger and heavier than I like.
So far, I'm loving this phone, and really do hope Apple brings back a smaller form factor. Maybe follow Apple naming conventions and make it an "iPhone Classic". I'm still getting used to Face ID over Touch ID, and have had to use Reachability more than I'd like, but overall, the 13 mini is a solid and capable phone in a comfortable, pocketable, one-handed form factor.