I have thrown the Defiant, Critical Theory and the Vivid. In my opinion, I just listed them in order of aggressiveness. These balls were drilled identically to my pin down HRR and belong to a friend. Change the thumb sleeve and I was off.
I will also admit, the HRR may be too much ball for a lot of bowlers on a THS. I stand 15 boards further left with the HRR than the Critical Theory and about 8 mo.re than the Defiant