The only thing going for his usual guess (ESTP) is his hedonism -- and that alone does not an SP make.
One- he was a Force-user. That means he had to have intuited his end would come if he went to Naboo. He went anyway.Darth Maul? I don't think so.
Two- in the novels, where he actually has dialogue and descriptions worth a damn, he's shown to be extremely Si-dependent. He relies on, and only on, his training. ISTPs by contrast rely on situational awareness (Se) and deduction (Ti).