Two stage is the best. The first (big) cylinder pumps the air and the second smaller cylinder compresses to a higher pressure. A 2 cylinder single stage is just like 2 single cylinder compressors.
What is better and why?
Two-Stage Single Cylinder VS Multiple Cylinder Single Stage
For the price you cant beat the Husky 80 gallon twin cylinder from Home Depot...........
Got one and have ran the **** out of it, still works like new.