He is much faster than Dark Emperor Santa in both attacks and movement speed. He also warps Cat Units with every attack, which makes him quite a serious opponent. However, his range is much shorter. Unfortunately for him, the warp is usually less concerning than Dark Emperor Santa's freeze, due to Satan Claus's shorter range.
Rover Cat is perfect for protecting your attackers and crowd-controllers against Satan Claus, being spammable and immune to warp. Other Warp-Blockers can also help in keeping Satan Claus from advancing.
Because of his fast attack rate and guaranteed warp, it's hard to get Rushers or Tankers in to kill Satan Claus without good timing or something to freeze him.