Either brand, or any size in that brand, are set to tow up to 5000 pounds. They both have the power to tow that 5000 pounds up any mountain road in the East or the West.
I would lean towards the Fleetwood because it appears that the Winnebago fiberglass roof is still attached/glued to the sidewall frame. As we have read on this forum, the roof can come loose and Winnebago will blame it on the owner for failure to watch the roof sidewall joint on a daily basis.