Pick what you like the bestThey are all easy to care for, and they all have their own specific issues that need to be met. I would not classify any of the three you mentioned as difficult.
Leopard geckos have more variety and color patterns to choose from at a lower price. Crested geckos do not need to be fed live prey which is a big plus for a lot of people. Fat Tails are a lot of fun and many new morphs are being created each season.
All three are easy to handle. As they grow in size it will be easier, with all three care will need to be taken when they are young as they are often "jumpy" and "flighty" until they get used to being handled. If I had to pick I would pick Leopard Geckos.
I don't think you will go wrong with any of the three
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