A nice garbage player will at least try to get carried while you're busy carrying them.
A toxic player is there to own the game. If they're carrying, okay whatever but it's still toxic to be with them and it leaves bad tastes in mouth; however if they're losing, oh boy, then you can bet your ass that the match is harder to carry than any garbage player who feed because they don't know what to do.
By comparison, I'd rather have a garbage player (strictly just not good at the game, no personality flaws, at least not vocal) because then I'd get less cancer overall and actually have an easier time carrying a garbage player if the toxic player is to feed.