Should i get Leopard gecko or a crested gecko?

Well if the tank isn't very tall (I would say you should have 16" off the substrate top), then you shouldn't get a Crested Gecko as they need a lot of vertical space to climb.

Leopard Geckos tend to be cheaper. Crested Geckos come with a lot of color and pattern variations which breeders assign dollar values to (they're bred sort of like dogs for particular traits), so unless you're buying from a generic pet store that sells them all at the same price, buying babies where you don't know the patterns and colors, or buying tailless males which have a common brown flame pattern, they'll usually be at least $80. Over $100 is pretty common and even $150 isn't uncommon. Leopard Geckos (unless you get a morph) usually aren't more than $70, and most at reptile stores are only like $40.

Leopard Geckos also get larger, although not by much. Their fat tails add a little to their larger size. Crested Geckos also get smaller if they drop their tails since their tails do not regrow. Very important to note that.

They're very different. Leopard Geckos can't climb glass at all and really don't climb much at all. They eat crickets and mealworms while Crested Geckos can eat a mix called Crested Gecko Diet (available at pet stores, reptile stores, and Amazon) which you add water to and which has all the necessary nutrients. Many breeders raise them just on this as it has everything the gecko needs and it's certainly more cost-effective. As noted above, Crested Geckos do not regrow their tails and do not have fat tails like Leopard Geckos which hold reserve stores. They are similar in the sense that neither requires UVB, but Leopard Geckos tend to need high temperatures than Crested Geckos. The low-80's the Leopard Gecko likes can actually be fatal to the Crested Gecko.

It's easier to house multiple Leopard Geckos together, although neither species should have two males in the tank. Female Crested Geckos are known to get territorial, sometimes more so than males. Usually no problems with a breeding pair. Keeping Crested Geckos alone is important to ensuring that the animal doesn't drop its tail.

with a 30 gallon you are better off with a leopard gecko. you can even keep up to 3 in there. the reason i would not get a crested is because they are arboreal so they like to climb and they are more of a look animal not so much a handle animal like a leopard gecko.

leopard gecko- crested gecko

Cheaper by maybe 10$

They both get about the same size

very similar but leopard will let you handle more

Yep(:

i work at a museum and all i know is that leopard geckos to me are cooler. they look cool, while the cresteds look creepy. of course, leopard geckos might be more expensive, from my experience, they eat insects, while cresteds just eat, well, we give them some mushy food. the insects cost more.