The good news is Tiffin has a wonderful reputation for excellent factory service after the sale. The bad news is so many know about it.
We've owned (3) Newmars now, my parents owned 1 Tiffin. I personally worked on their Tiffin more in 5 years than I have all 3 of our Newmars combined.
If I were shopping today Tiffin would not be a brand I would consider.
Also keep in mind the Tiffin is a laminate built coach, and if it's laminated it can delaminate. The Newmar used a hung wall method and cannot delaminate.
For me this one would be an easy choice.
On the rust issue jyrostng posted above, look at the date of purchase; I'd about promise that was driven on salty roads and never cleaned when it landed. We live in Northern NY, and the stuff they put on the roads makes EVERYTHING rust. The local Toyota dealer has replacement frames delivered by the truck load (honestly). My brother recently traded in a 2 year old Chevy truck with a not so great looking frame. Salt affects everything, regardless of brand. There is a reason ours never see snow.