I would say go for Leos but get a wooden viv. They look a lot nicer than a glass tank and they hold heat a lot easier.
For substrate I'd get Calci Sand as it's soft and it doesn't matter if they swallow some whilst trying to catch their food, they're known for pretty bad judgement. With all Geckos you will need to feed bugs at some point in their life, simply for exercise and nutrition.
Cresties need a temp range of 65-70F(18-21C) so really unless your house is warm I wouldn't risk going without a heat mat, especially in winter.
Personally, I think Leopards are better.