I have outlets every 4-6 feet around the shop, all run in surface mount conduit down from NM in the joists. I used 12 ga wire except for the DC and compressor that goth 10 ga. I put quad boxes at each position with one 240v outlet and duplex 120's on a MWBC. Most of my machines are on mobile bases so being able to push them around to other places is sometimes convenient. I ran dedicated circuits for high draw tools and things that might run at the same time as other tools (eg DC and compressor). Lights are separated from tools so they don't go out if I blow a breaker. Because my ceiling is open I can easily pull another wire when required.