What's the difference in performance with compressor sandblasting?

There is none. The disadvantages of a compressor beside being big, bulky and loud, is that it loses power (pressure) very fast. WIth a 10BAR 100Liter compressor you will very quickly be at 8BAR, once you have started. Then you will have to wait until pressure is back to 10BAR.

The blasting itself is quite the same. It takes off the paint and rust with exactly the same ease or effort.