What is better The Tippmann response trigger or the E Grip?

The response trigger is cheaper and more reliable because of the mechanical nature. However, the E-grip provides more functionality and it is widely accepted as the superior option, one downside is that it requires a 9-volt battery so you'll want to keep a spare on you just in case. Also the repsonse trigger is not allowed in tournament games, where the E-grip is completely legal.