I have all three and out of them leos are last on my list because I have had bad experiences with them. I have 7 leos, two are easily handle-able, one just straight up hates me and tries to bite me through it's cage and the others are super flighty.
I love my fat gecko, she is super calm and friendly. Her care is similar to a leo but she does need higher humidity and she is more sensitive to light.
Cresties are by far my favorite and they are very different than leos and fat tails. They are super easy to care for and very cool to watch. They are also very friendly.
That being said, you get the best color variation with leos but cresties are cheaper from what I have seen and come in some really nice colors.
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