Freezers are not put on gfci circuits because we don't want to take the chance of spoiling our food when the thing trips accidently. A compressor may or may not trip a gfci, and if you are spray painting a vehicle you do not want to ruin the finish by having the pressure drop when it trips.
You may want to chance to 20 amp 240v for a larger compressor, which negates the gfci anyway. It's only a matter of how much you are willing to spend, and what you want to be able to do. You don't even need a dedicated circuit for a small compressor, just plug it in and use it as is on the garage general purpose circuit. Results may vary. But, a garage is a man's castle. My house is my wife's domain, she picks out the colors , furnature etc.... The garage and sheds are all mine. If I want twist lock recepticles and plugs, I will have them.
