Sure glad you're doing research...bearded dragons have a LOT of personality, but they're also a LOT of responsibility, & need DAILY feeding & care...they also need
lots more room, special lights, high heat...I'd call them high maintenance, + more expensive to keep. I took one in as a near-dead rescue many years ago from an
owner who fed only crickets, causing the dragon to be totally constipated while simultaneously starving, & was about to dump him outside; I pulled him thru, which
was very rewarding, & I ended up with a good-sized lizard that loved to snuggle on my shoulder. He never tried to bite, if you don't count the time he caught his
reflected image in my mirrored closet door & when he couldn't catch his "mortal enemy" in the mirror, he turned & went after my dragon-sized foot! -Male
beardies are fierce toward other males, & don't have a clue that mirrors aren't real...& anyway, he missed my foot! Spike was a hoot, but you have to feed them
fresh food daily that's balanced...they don't eat just one thing, & you'll need to be very involved.

Leopard geckos are very cute, but more of a pet to watch...they don't care much for being handled, from my experience with them. Much simpler to care for though.
I've never had cresteds, but I enjoyed Tokays...however, that's not a kid's pet, they bite hard & may hang on.