I see slightly more Rams than Fords being used for hotshot and commercial work in my neck of the Rockies, and basically no GMs. TFLtruck does some good reviews of towing heavy with DRW 1 tons in the mountains. There's another channel on youtube called PD Diesel Power from a guy who runs a hotshot fleet in the Spokane area with lots of trucks over 500k miles. He primarily has Rams but also has Ford and GM trucks that he compares against. Both great resources to get more opinions.
The latest Powerstroke is undeniably the fastest and has closed the gap on the Cummins in terms of the MPG advantage it traditionally had. The driving dynamics of the V8 vs a inline 6 will always make the Cummins a little slower revving, but there's also way more space under the hood if you're planning to do your own maintenance.
All three of the drivetrains are pretty solid these days but I think there are important differences in the transmissions and fuel injector pumps. GM doesn't use an Allison-made transmission any more, instead they manufacture it and got approval to use the Allison brand name. Ram has improved the 68rfe over the years but it's not a medium duty trans like their Aisin. Better for tuning though.
Ram switched back to a CP3 fuel injector pump in 2021 which I think is pretty big advantage over the CP4 pump that Ford is still using. The CP4 pumps are known to self destruct and take out the fuel system and turbos.
Historically, Ram has been a little cheaper than an equivalent Ford, but who knows these days.
Honestly, I think the decision would come down to what inventory you can find in your neck of the woods and your preferences on a lot of little things:
Ford cab is a little bigger than the Ram and has a flat rear floor if that matters to you. Personally I think the Ram interior has better fit and finish.
Ford comes with a rear locker vs Ram's rear LSD.
Ram has a factory air suspension option.
Ford offers a 450 pickup with better turn radius and 19.5" wheels if you're looking for even more truck.
Integrated tailgate step in the Ford vs kick-down step on the Ram.
10 speed transmission in the Ford vs 6 speed in the Ram.
Aluminum vs steel body panels.
Ford mirrors power extend into tow mode, Ram's you have to flip up manually. Ram has heated and powered convex mirrors though and Ford/GM don't.