GM-Allison VS Ford
Dave,
The Ford is a gas hog compared to the GM 8100 Engine. There have also been a few recalls on the Ford V10 engine from what I have read. I own a '02 Southwind with the GM/Allison combination. It is a strong engine and although I have had trouble with the coach the chassis has performed beyond expectations. Towing a dinghy up Black Mountain near the Tennessee/North Carolina border will test the metal of any motorhome. Mine has done it a few times with flying colors. I know there are a lot higher mountains out there than this one but I wouldn't be afraid to tackle any of them.
Maybe you could take a trip to a popular campground, where there will be plenty of motorhomes, and just asked some of the people who own the different units.
I like the GM better, but then I am a GMC man.