Even if you have the ability to chain throw well, thats like saying if I dont mess up I can tech chase them to death.
Wait, no it's not! Marth's chaingrab is actually pretty easy to preform, and it's all guaranteed. Upthrow chaingrab+uptiltfollowup+aerial followup is 100% guaranteed regardless of DI and is essentially a free 70+ percent off of one grab.
Marths chain throw is most effective on FD where as foxs upthrow upair, or upthrow onto a platform and drill (assuming the dont smash off) into more upthrow upairs works every where and the efficiency doesnt really change.
Well, the effeciency does change a little since Marth can tech on the platforms. But you're right that it's still effective.
But you forgot to mention Marth's plethora of platform traps that prevent Fox from getting down. The top platforms on dreamland and battlefield are an exception of course, but Marth's platform game is almost as deadly as his chainthrow.
I dont personally like the argument that difficulty should be used in place of effectiveness, because if it works better and is humanly possibly-the sky is the limit.
but realistically, fox will get upthrow upair kills more often then marth gets kills off the chain throw.
Upthrow->uair doesn't kill from 0% though. In that sense Marth's chainthrow is far more effective because it is an immediate threat. Marth getting a grab anywhere between 0-70% can be death for Fox (and he can still combo for a good deal after that, it's just harder to control where you're sending Fox after that), while Fox has to wrack damage from other means before his kill combo actually kills.
It pretty much seems like the marth needs to be better because they have to look at more options(situations to deal with) to get maximum effeciency out of the moveset. His upthrow is more complex and requires more knowledge and skill to get into those kill move positions. Its also harder to do.
But the tradeoff is that it is more effective <_<
Marth has more options but fox doesnt need them, upthrow right into a kill move that can combo into itself, while leaving most oponnents in a position they dont want to be in(above fox).
But Marth doesn't die from one grab (exaggeration I know, I'm just emphasizing that you're weighing them incorrectly)
I'm just trying to show you that a grab for Marth means a lot more than a grab for Fox. You're saying that "Marth's followups are harder to perform, therefore he is at a disadvantage," but forgetting that they are not getting the same reward from those followups. Fox gets one move, 2 moves at max, while Marth gets a solid 70%+.
Platforms hurt this a bit, but then again platforms have other effects on the matchup.
