AKKKK - three of my favourites!
I think I have to go with Adam West. All three are amazing examples of the genre, but this version of Batty-Boy has to be one of the most gun-wrenchingly hilarious movies that I've ever had the pleasure of watching. Not a dull moment: pure, unadulterated entertainment from beginning to end.
Sin City was a huge achievement, and Downey Jr.'s Iron Man is one of my favourite superhero performances...but in terms of sheer watchabilty, I'd be more apt to grab Batman any day of the week. Besides, the other choices are severely lacking in shark repellent:
