I agree with this guy. I have a 2013 sunseeker 3170. Love it and I think I got a good price at 56,000 bucks.
Looked used for a long time. Realized wouldn't find what we wanted. Bought new last August after considerable research.
Got a Forest River Sunseeker. Only considered that brand, Winnebago, & Nexus.
IMHO...
Winnebago: Over-rated. Many happy owners no doubt. But older style construction materials. Fiberglass roof is great. But uses wood walls. That technology is older. Problem is wood walls can absorb moisture &, if / when that happens, it will lead to delam which is one of the biggest drains on RV values. Higher price than entry level based on name. Eventually ruled them out based on the combination of their higher price, the older wall technology, & our only occasional use of the unit.
Nexus: Fiberglass roof & Azdel walls (for those that don't know, Azdel doesn't absorb moisture so delam won't happen, has a higher R value, & is lighter). 2 check marks. Great reputation among a still small group of owners. Higher price which appears justified. For our only occasional use though it was more than we wanted to pay. If we were more regular users of the unit, I probably would have bought Nexus.
Forest River Sunnseeker: Also fiberglass roof & Azdel walls so 2 check marks again. Pretty good reputation among at least newer owners (which I would agree with as one of them). I think older Sunnseekers left a lot to be desired. But since Warren Buffet bought out Forest River, he really sank a lot of money into improving the Sunseeker line. Value priced. Was perfect for us given our occasional use.
jeffcarp: On your list, the only change I'd make is to move Winnebago to #4 with the rest (again based on older wall technology).
Sabluka: Coachman uses the TPO roof as mentioned above which wouldn't be my first choice but does use Azdel walls. Short answer to your question is I think there are better options than either. But comes down to budget, what's most important to you, etc.