When you find the right kind of Red Delicious (not mealy on the inside, 'course), they are, well, delicious. I find that they do tend to get that way. Mealy, I mean. Dunno why.
In good old South Jersey, our local apple orchard grew the fab. Molly Delicious. Have never seen it anywhere outside So.Jo., but so big, so juicy. I miss muchly. Cue one dramatic tear.