I chose a peophin for my first pet after a LOT of looking through the species that were available at the time. Draik would've been my 2nd choice, I like the Maraquan Draik a lot. But Draiks are limited edition. So I don't have one, could hatch a pirate draik egg, but I'm good for pets right now, maybe someday.
As for LEAST favorite, Chias, then Kikos, definitely. Chias are just, Uuuuuuuugly. Especially their basic form. Kikos, the band-aid on them really is kinda gross to me. Also, why do so many have them? Are they accident-prone or what? I mean, if they were on the bottom of them, like if they had to bounce along, that would make sense, but on the top of them? Weird. Grundos, yeah not getting one of those either.
I also really like Xweetoks, an Ice Bori would've been cool, but I never cashed in on the promo back when the Boris were a new species, so I lost out on that one. lol I'm pretty ok with most of the rest, but mainly only ok. One last note about Unis, that having no defined eye kinda bugs me, makes 'em look a little like taxidermy in a way. Otherwise, I might've gone with one of them for my first pet.