If you are doing a lot of boondocking (ie: no shore power), I would lean toward propane but the industry is moving towards 12v fridges.
With 2 full propane tanks, going a month or two without refills is very realistic, so not a huge burden for most to keep them full.
That said, with a decent battery/solar system, it's quite workable to go 12v.
Ignore people who simply pronounce a size for the solar array and battery bank. Do an assessment of your consumption and production capabilities. While the fridge is a major consumer of battery power, there are other items along with how you expect to live while boondocking. When someone pronounces 200w solar, that might be overkill or it might not be enough.
Also consider where you will be camping. If it's in dense forest, solar is not very useful.