We just bought our second Rolair compressor, this one used off Craigslist.
Like Kory said, the larger the air tank storage, the better.
Thus a "hot dog" style, single larger tank air compressor is better then a wheelbarrow style dual small tank one, if you can find one ?
We have used Rigid compressors, Ingersoll Rand, DeWalt, and others over the years. A Rolair is at another level completely, as far a build quality goes. However, the "best compressor" is that good deal on Craigslist, when you NEED one, LOL
But IF you have a choice between a used Rolair, and any other used air compressor, that would be my choice, assuming it has not been beat to hell.