Bios > Champs
unlike champs, who have to restore their SP after a single attack, Bios can deal several times that damage in the amount of time it takes a champ to get back into the action
Wizards cannot outdamage a Bio or a champ, but they CAN Ice Wall, which is something neither of the two classes have. Plus, IW creates lag for other users, which can often mean the difference in a match (I, personally, love disconnecting other players by spamming icewall on them and the MvP)