A bigger motor will be more efficient as well as being able to keep up with the air demand better. Same goes for having a 2 cylinder dual stage pump. If you're going to run a sanblaster, you want to get the biggest HP motor, pump, and CFM you can, as blasting is a high airflow demand job. You'll also want to consider one that can be run on 220 instead of 110, again, they run more efficient that way. You'll also want to avoid oilless compressors. The dont hold up very well under 100% duty cycle jobs like sandblasting or hig air consumption equipment like die grinders.
