The walkoff on pipes can't be chaingrabbed off by anyone except falco, which is % based and won't even get you to the top from 0 at the bottom. Ddd can only chaingrab dk up it, and it's not like ddd will lose a game and need to cp a dk LOL. But it's too steep for ddd to chaingrab anyone else up it. It also has no ledges, and it is mk's worst stage (why do you think it's always banned?).
I'd put up a huge arguement for banning porttown and mansion, but you seem stuck on them, so, as it is, I'll give an argument for why distant planet is better than either of those stages.
Distant planet has a sloped walk off, it has items, and it has that rain that everyone hates. It has a slightly higher than average ceiling, (not nearly extreme as japes) and a bulborb that kills anyone that stands on it for more than a few seconds. The sloped walkoff is similar to the one at pipes, but it being less steep means yoshi can grab release a few chars off it. (G&W and ness are the only ones that come to mind now) DDD can still only chain dk off it. The items really don't influence gameplay much, as you have to attack the plant before you can get them. They don't spawn much (think items on low) and they do small amounts of damage and have no more hitstun than any other attack in the game. The rain isn't a problem, all it really does is prevents people from camping the walkoff for too long.
I would argue for norfair too, but without a ledge grab rule... lol...
@ serve: you play hon?