Well that really depends on what you want to do with it. Oil less simply won't last as long and are noisier than all get out. Small compressors like the hot dog and pancake compressors are usually oil less and made for tiny short bursts of air like required for the operation of air nailers and the like. Anything you want to use to that will required long blasts of air you need at least 15 gallons and up. I have a little pancake compressor and I can't even blow off my bench without emptying the tank. So.. if you want to run lots of tools and sustained bursts of air don't get one of the small oil less compressors. Avoid oil less period if you can and your budget allows it.... it will last longer. Hope this helps.
Corey |