I'm a big fan of the HR construction vs the Fleetwoods (hung wall vs laminate) and 99 times out of 100 I'd the HR. This case might be the 1 time I'd say Fleetwood. The engine difference alone would make me look hard at the Fleetwood.
Having said that, look close. The Fleetwood is laminate construction, and things that are laminated tend to delaminate over time. That simply can't happen with the HR. The other thing is take a good look at how things are screwed together. That MY was juust before the big crash and some companies were feeling the pressure. Being '07's you should be good with both, but take a look.
2 good choices, but if all else was equal I could hear 400 HP calling my name.