Well Slade has shown that he is pretty tough, but not on Robin level. Robin has gadgets that would turn most people to jelly just thinking about it. Robin is a very hardcore character who never backs down. Slade could never take Robin down but at least he got a win. Robin wins.

Update! I think Slade’s fire may be enough to win this one. Slade wins.

Update! Robin has obtained Starfire’s powers, so that should be enough to win this round. Robin wins.