I am not concerned about how fast my coach can accelerate. I am concerned about the ride and the weight it can hold and the quality of the manufacturer and lots of other things. One thing I really like about the diesel is the exhaust brake. It takes the stress out of going downhill. I go downhill at the same speed I made it up the hill if the grade is the same on both sides, and it works well.
I think this subject has been beaten to death in lots and lots and lots of threads. The best thing to do is read all those threads and decide which one will work for YOU!