It will depends on your budget
Leopard geckos themselves and the enclosure will cost a lot less whereas BTS will cost a lot more, a BTS will need a 4x2 cage.
The second consideration is the time you want to devote to meal prep and whether you want to feed bugs or not.
With Leo you will have to have bugs available at all time most people will have a mealworm dish in the enclosure and replacing with fresh gut loaded mealworms every day every other day. Mealworms are easy to breed so you can either setup a small colony or go and buy them.
A BTS you can prepare a batch of food that you will freeze and thaw on feeding day, it will be composed of greens, chicken liver (better then cat food and does not contain all the preservative in it) and fruits. The advantage is that you can shop for your BTW food while doing groceries.
Other determinant factor will be the size.
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