Sanders has by far the best win of the two, but Toney has a deeper heavyweight resume, and importantly a better record vs Rahman.
I feel as if Sanders just isn't a smart enough fighter to decipher Toney's defense. He's fast, he's strong, and he'll make a good account of himself early on, but I have no doubt that Toney will knock him out eventually.
Toney was best against big slow dudes that loaded up on their punches and had a one dimensional attack. Sanders is a big fast dude that throws punches in bunches and goes well to the body and head. I think Toney gets battered badly because he doesn't even have the firepower to keep Sanders off of him. I guess I could envision a scenario where Sanders blew his wad and Toney did well late but by god he'd be a mess.