Another happy Redwood owner. We fulltime in ours and have only had the convection oven issue to deal with, it was replaced by Frigidaire under warranty easily enough. I don't think either of the brands you mentioned are bad. We looked at both when we got our, wish the Grand Design had full body paint though.
Be sure to do your research on the Internet and not just this forum, lots of people here have VERY strong opinions based on second hand information. Take that for what it's worth.
BTW the Redwood has a very good 2 year warranty, that was one of the determining factors for us.