We elected to go with an apartment fridge in our build. We have 3 kids, so 5 people total and really needed the space for food. We haven't done much long distance traveling with it yet, so I can't speak to its energy consumption under real world conditions but we did have a 12v RV fridge in our camper a few years back and we hated it. It took FOREVER to get cold, needed to be damn near perfectly level, and never really stayed at a good "refrigerated" temperature with real world use.
I expect that the 120v fridge will be our biggest consumer of electricity so I have a few ideas to help minimize its impact.
First, the plug for the fridge is a switched outlet, so I can turn it on and off without having to unplug it or go to the breaker panel in the trunk. This way I can shut it off if its not going to be used, or perhaps overnight when it wont be opened and there is no sun on the panels.
I bought but haven't installed small springs to pull the doors shut so they won'y be left open longer than needed by the kids, and will help hold the doors tighter against the weatherstripping.
We also plan to use block ice in the crisper drawers to help keep it cold and minimize electrical loads as needed. We have a few collapsable 1 gallon plastic jugs that will be pre-frozen and stored in the drawers to help keep her cold, and we can refreeze them by sticking them in the ice bins at campgrounds, (something we did in the past with the RV fridge) or simply buy the large blocks of ice and replace them with those as we travel.
Lastly, making sure that you get pre-cooled foods as much as possible helps limit the cooling load as well. Not a perfect plan by any means, but I am confident it will work for us.