If it rolls on tires and is made by the hand of man, it'll have problems. All brands do because as far as I know the Almighty hasn't gone into the MH manufacturing business.
As for why the topic started hasn't considered a specific brand, what difference does it make? He has obviously narrowed down his choices and wants either a Fleetwood or Winnebago. Maybe (like me) he has looked at other brands and didn't like them, or perhaps he has heard bad things about them like those said about Fleetwoods and Winnebagos. In any case it's irrelevent because it is, after all, his choice.
My first big RV was a Fleetwood and I had great service. Like a fool I believed all the "Brand X" cheerleaders and changed brands when I bought my first MH. After reaching my tolerance limit for problems with that coach I unloaded it and went back to Fleetwood.
And there I will stay.