I would stick with the Norcold. Jimmy D. might chime in he has a Norcold in his boat. It worked real good when I had it, and it was not real hard on the batteries.
Another tidbit that helps keep the frig cold... There is very little ventilation in the frig compartment.... it gets hot around the frig compressor. Aft bulkhead in that compartment has a 4" hole, mine did anyway... I put a 4" computer fan right over it to suck the hot air out away from the compressor.. made a world of difference with keeping the frig cold... just did the same thing with my new boat....