I have 20 plum trees and by far my favorite Japanese plum is Beauty. I call it a kitchen sink plum because it is so juicy you will wear it if not bending over
Personally I only have disdain for Santa Rosa, if I'm mowing and there's low hanging fruit to grab I'll have a bite to remind me why I'm not impressed but it is nothing I would go out of my way to eat. Satsuma is pretty darn good it is a drier,(than Beauty) meatier plum.