I also considered these three. Being that the Diesel Tremor was just $10k more expensive than my current 37PP Raptor, it was a hard choice because that's every bit of $10k more truck. But in the end, I knew I wanted another Raptor given my incessant love for the Gen1 trucks. I was able to test drive many Raptors, though not a single 37PP. It couldn't literally be that much different on a day to day basis, right?
Right.
It's really not entirely different, as if you browse around here on the forums, you'll find out. Thicker shafts for the shocks, different tires, depending on what year you get you'll be forced to get a blue interior, etc. I have no regrets on getting my 37PP instead of the Diesel Tremor.
That said, people sometimes rant and rave about the TRX. People sometimes rant and rave about the Raptor. Sometimes they equally complain. I did test drive a TRX twice while searching for my 37PP, and although it was hilarious fun for both myself and the salesman, it was akin to my feeling about accelerating in my wifes Mach-E GT; it's bonkers fun for those few seconds and then it's just boring and without a soul.
I also really support Ford and their products, so there's that working against the TRX, to be honest. If I could find a Raptor R for MSRP, I'd have bought it yesterday. Just waiting for the stupidness to die down.