I just bought my first about a month ago. Even within a particular brand/model you can see a range of quality. I wouldn't get TOO hung up on this. One thing that influenced my decision was that some camp grounds don't allow coaches over 10 years old. This or more of an issue for me since I will be full timing and staying by the month.
I'd also factor in the mileage on each unit. Not too high, but also not too low. Do you happen to know the mileage on them?
Are any of them rental units? I immediately ruled out the ones that used to be rentals. The reason is that during each of my trips to the dealership, I overheard the front desk people on the phones talking about towing/repairing rental units because the renters beat them up.
Don't just kick the tires. Check the date codes. Some of those coaches will have tires that need to be replaced soon. You're looking at 2-3000 grand right there....this may be a negotiating point as well. Check the battery age while you're at it.
See if you can test drive all of them. That might help you narrow it down some.
Also test EVERYTHING. Anything that hints at being problematic is something that could keep your from enjoying it. None of them will be perfect, but if the dash AC doesn't work, or the generator doesn't start, etc, it might be a headache you don't want to deal with?
If none of that helps.....which one looks cooler? I say this in jest....but not entirely. I teach guitar lessons, and I have people ask me for advice on which guitar to buy. Sometkmes buying the one that looks coolest is the one that will get you the most exciting about using and enjoying it.