DDD vs Marth is 60/40 DDD.
Lol, why don't you tell me why the average competitive Marth can succeed against the average competitive Snake than go for the top level of play? I'm pretty sure there are only a few people in that realm, and it would be much more relevant to discuss raw Marth vs Snake abilities.
I actually remember Steel making a post saying Ganon could be problematic for Marth due to his range....
Unlike MK, Marth really doesn't **** any high tiers. Though he might initially have more dominance, I believe he will be easier to figure out how to fight than MK and his winning/neutral matchups may become worse for him.