Echoing bkesslersr a bit, in all fairness, raw hp and torque specs are only part of the equation. The big class 8 based rigs like the Cascadia and Volvo Classics certainly have the 500+ hp and 1850+ lb-ft torque specs, but they also tend to be much heavier, both empty and loaded. Even the M2-112 Newmar Supreme Aires are very heavy (too heavy, IMO).
So be sure to also look at hp and torque per pound, and you'll find that the options are not as far apart as they may first seem. It's not uncommon for 38' Classics to have 33K lb empty weights, which can be 5k lb heavier than a similarly sized Verona. That weight difference will likely only increase as you option up a custom build (tile floors are heavy!) and then load up when you use it - it takes discipline and marital persuasiveness to not load up when you know you can!