KOH Backdoor Challenge this year: Treps, by a lot. Sure, good driver, perfect line, perfect rig...blah blah blah
I'm conflicted since I have some paid for 39 reds, but I drag over every pebble out there with the tons. 42 Treps are about 50% more expensive than the 39 reds, so it's hard to justify. 40 Treps are just slightly less expensive than the 42s.
I'd argue, size for size on the same vehicle, the reds only close the gap on 10% of obstacles, and we know throttle can overcome half of that.