If Sonic said "You're too slow" in Smash Ultimate
Sonic's best taunt in my opinion is the one where he runs in place. However, since his voice actor changed to Roger Craig Smith after Brawl, he no longer says "you're too slow" and instead says "Sonic Speed" I think the quote "You're too slow" makes for a much better taunt. So I found this clip of him saying it in sonic boom and played it over his taunt in Ultimate, just to see what it would be like.