Another diesel vs gas or torque vs hp thread with a lot of myths repeated.
Diesels do have a couple of advantages. One is that their ratings do not drop off much at high altitudes. If being the first to the top of a 10,000 ft pass is important, the diesel is the way to go. If you don't like running engines at their (designed for) higher rpm ranges, again, the diesel is the way to go.
On the other hand, a 362 hp gas engine operated as it was intended to be operated, will smoke a 300 hp DP pulling the same load on grades below 3000-4000 ft.
It is torque that turns the wheel.
It is hp that determines how fast that wheel turns.
As for the V10 in particular, it's peak torque is around 3800 rpm with high torque values between 2800 and 4200 rpm. It's peak hp is at 4800 rpm. If you run the V10 at 3500-3800 rpm climbing a hill, you are giving up at least 50-65 hp
I routinely run my V10 (an old 310 hp model) at 4500 to 4800 rpm when climbing a hill or accelerating. I've added some sound deadening to the dog house and don't mind the noise. I also know the engine was designed to do that.