Unfortunately, we can't compare sales data from American markets until ioi somehow edits it so we can compare the few Sonic games on Sony/MS systems. As far as I remember, there were only 2-3 Sonic games on Xbox and Sony systems. The sad part is we'd be comparing Sonic games on 360/PS3 that sold sightly less than Sonic & The Secret Rings despite the 360/PS3 versions being rated around 20% less (on gamerankings.com) vs. the Wii game. The only reason I put Sega v. Nintendo numbers is because those were the only ones available. I know we're talking Nintendo vs. MS/Sony numbers, but I can't get any of them right now.
Back from the dead, I'm afraid.