I own 10 ukuleles, 4 sopranos, 4 concert, and each one tenor and a baritone.
I got one soprano (ovation) and a no-name baritone back in 2002, and all others in the last 3 years. But the 4 concerts are the last 4 I got.
This is what I will stick with, concert.
Maybe it is just the one tenor I have (again ovation), but this is WAY more a guitar than a ukulele.
Tenor makes some things easier than concert, but then again it is too big already for other things that I can still do on a concert (and are easiest on a soprano).
So for me goes:
Baritone: a castrated guitar
Tenor: Easy to play, but too close to guitar, some specific ukulele things I can't do there anymore.
Concert: Mostly easy to play. This is THE ukulele
Soprano: If you can play a song on a soprano you should do it. It sounds the most ukulelish. But sometimes it is pretty hard, especially in the high frets.
(And for all of those (including baritone) goes: high first string (don't get me started which string is the first string when you call these strings GCEA!). Low first is even more guitar. But don't get me wrong, I like guitars, played them for most of my life. But nothing is better for playing a guitar than a guitar, no need to get a ukulele for that!)