Niko45
Smash Master
There's a pretty big gap between Marth and Sheik once you look at the entire cast imo. Marth is clearly better vs fox and ICs, probably better vs Falco and Puff. After that, I can't really find many matchups that Marth is better at than Sheik including vs Marth and vs Sheik.
Marth is still viable, tho I'd argue less equipped than Sheik overall against high and top tiers, but Marth's real flaws come out in lower tier matchups, imo, where Sheik can beat Links, Pikachus, & DKs mindlessly but those characters can actually beat a Marth if he doesn't pay attention and know what he's doing. That says a lot to me about the difference in character ability.
Marth is still viable, tho I'd argue less equipped than Sheik overall against high and top tiers, but Marth's real flaws come out in lower tier matchups, imo, where Sheik can beat Links, Pikachus, & DKs mindlessly but those characters can actually beat a Marth if he doesn't pay attention and know what he's doing. That says a lot to me about the difference in character ability.