[chuck53]

When we were looking for a microwave, it wasn't so much who made the best but more, what can we find that will fit the tiny space we have to squeeze it into.
We had to look around quite a bit, but finally found one that suited our space requirements and so far has done a good job.

I've never heard of a 12v unit but I'm guessing if they were available, they would not do a very good job. Much like the 12v coffeemakers that everyone who has one says they are extremely slow.