Roofs-Fiberglass vs. Rubber/TPO

We are starting our research into Class A's for my retirement 8 years away. We'll probably purchase in 5 years or so when our current TT is 7 years old. One of the items that has caught my eye with Class A's is the roofs. It appears that the lower end/base models have a rubber and/or TPO roof while other models, including all Tiffin models and Winnebago models we have looked at, have a molded fiberglass roof. Based on my travel trailer roof experience (I have sealed all my roof seams with Eternabond tape for longevity purposes), it seems like going with a fiberglass roof is a big deal if we plan on keeping whatever Class A we buy for 8-10 years or longer. But I'm assuming there are still roof seems to maintain on a fiberglass roof?

Am I seeing this issue correctly?