First, or you buying new or used? Makes some difference. Winnebago is known for its quality of build and excellent factory support. Since 2005, or so, Fleetwood has improved its quality control and is producing much better coaches. That is, of course, only my opinion based on reading these forums.
Most would tell you to choose the floorplan and amenities that best suit your needs/wants. Good advice. All else being considered, I would go for the Winnebago based on their reputation.
I looked at the Winnebago 35F and did NOT like the bath and a half floorplan (I think that is the 35F). You lose LOTS of storage space for an extra toilet. Unless you travel with more than you and your spouse, why do you need that?
Again, only my opinion.