We've owned both, it's a Ford/Chevy type of question. Spartan is fine, so is Freightliner. Either one will out live both you and the house attached to it.
Buy the Newmar and enjoy your full timing. :B
Actually, all kidding aside, of the 3 choices you've offered I'd eliminate the Thor for a number of reasons.
Newmar and Entegra are both wonderful units, only one offers Comfort Drive - the Newmar. We've own a CD unit since Aug '07, it truly is a game changer. That was our 3rd new Newmar, if we ever decide it's time for another it will be another Newmar.
