Both are nice, high end coaches from reputable manufacturers. Both have a loyal customer following who speak highly of their customer and factory service.
We recently traded up and looked at used Newmar (Mountain Aire and Essex), American Coach (Eagle and Tradition) and landed on a nice, one owner Country Coach. If you check them out thoroughly and can confirm they have been properly serviced, probably cannot go wrong with either of the brands you are considering. For us it was a matter of finding a one-owner coach that was maintained well and had the features/floor plan we liked. We were amazed at some of the nice, expensive high-end coaches that had been trashed by previous owners.