Ultimately depends on how much time you spend connected to shore power. In our case that is virtually never so we need machine that is straight 12v. On Raven we have something that looks like an el cheapo version of the Stanley. I like DeWalt gear but the need to recharge battery kills that idea.
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett