It's all about CFMs. You need to decide what you'll be using the compressor for. If you plan to use a spray gun, you'll need
a bigger compressor. Most HVLP's consume a healthy 10-14 CFM and you want to have a compressor that is bigger so that it isn't running constantly when spraying as you'll get quite a bit of moisture in the air which then requires really good filters. For an impact gun, the size/price point is good enough. Other things to think about are power and mobility. Bigger compressors for a home shop run best off 220V and are stationary. You then have to plumb your area with drops. Keep in mind that noise will be a consideration when it's kicking on and off constantly. I have mine in my unfinished basement so that it's away from the attached garage when I'm out working on the car/truck. It's a 3HP, 220V, 80 gallon very old sears
unit - about 40 years old. It puts out 15CFM at 90psi and I have sprayed cars with it with a Deville-Bliss gun that consumes 12.5CFM. I wouldn't consider any smaller compressor that than for my spray gun. Finally, consider Craigslist too.