Well I don't know about the best, but the Golden Horseshoe across from the Mark Twain Steamboat entrance has a HUGE slice of gooey chocolate cake for like $5.00 bucks. Really, it's probably about 12 inches long and a good 5-6 inches wide. I'm not a big cake person but did have a piece of the one we bought - I had no choice since it was so big and we need all the help we could get!, and it was OK. Good to split if you're with others, and the price is not bad.