Just my opinion, but IHRA appears to be more "newbie" friendly. I was a member of NHRA for 30 years.
As for the argument that there are too many classes in IHRA, that could be good or bad depending on one's point of view.
I view all the classes as a positive being a newbie. We will start out with a Pure Stocker and if that works well, then we will step up and modify the car to run Stock.
I am a fan of the newer body styles and big block carbed V-8s, so the IHRA Crate Motor and Stock GT classes look appealing.