From our years of RVing, almost all of our RV's had 2 door Dometic units. Whne we bought our first diesel pusher it had the Norcold 1200. I don't know what years they came on the market, but my guess is that Dometic came into the large refer market a little later than Norcold. The Dometics have some issues, but not like what you hear about with the Norcold 1200 series.
We finally tossed the Norcold and went residential. We'll NEVER go back! No matter what you buy, think about putting in a residential refer as part of the purchase.