I would think that Polynesian Isles would be better, at least from what I have seen and heard. I don't have first hand expierence with either. Oak Plantation is closer to Seaworld and "I" think it is in a better (easier to navigate) location. BUT, since you asked which would be a better "resort". I think from just looking around Polynesian isles, that it is a little higher quality and it is beautifully landscaped. Everything I have seen or heard about Oak Plantation, gives me the impression that it is of a little lower quality and worn. Hopefully you will get some input from folks who have stayed at either. I know, it's a hard call!