I'd say my favorite part was the first drop, even though I have to admit that I actually like the first drop on the NTAG a bit more.  What is remarkable to me about IRAT is the airtime... it's outstanding.  And the bunnyhop right before the quarry wall drop really caught me off guard.  I LOVED IT.  I don't have any rides on El Toro or Skyrush, so I don't know about those.  but know that the new rattler gives a healthy does of airtime, and it's smooth as butter