I like mild relic But not heavy relic... What's nice is you don't have to worry about putting that first nick on the paint or a lot of pick scratches... Just play away... Your not treating it like a new Corvette... 'Ya Know...
With air compressors when using it for spray painting, sandblasting etc.. The bigger the better !
Smaller inexpensive ones just wont keep up... I know from experience.. I was a Mechanic for 30 years...