In a quick Amazon search, I don't see any MityVac branded extractors that offer both pneumatic and manual modes in the same extractor.
The FourUncles that does have both modes, does not have a 'reverse' mode to expel the fluids.
I'm not sure how to rank those options against each other. I think the shop air option sounds nice, but then it is theoretically less portable.
I have a lot of engines, and I've never used an extractor outside of a smaller syringe-style that I've used for the last few portable generator oil changes.
AFAIK, there are no pneumatic MityVac extractors.
10 pumps, with 1 hand, extracts your crankcase. Maybe a few more at the end as you fish around to get as much oil out as possible.
The key is warm to hot oil...
Flip the flow direction switch, 10 more pumps and 2 minutes later your extractor is empty.
If you have to lift and tilt a full extractor, you will make a mess sooner or later.
Reverse flow is, in my opinion, a requirement. Otherwise the tool only does half the job.
Even though I have not used one, the pneumatic extractors seem to also have bicycle pumps that that's a non issue.
I am not a shop, just a garage wrench... I would have to set up the compressor, hook up the air hose and fire it up.
The MityVac would be half way done extracting before the pneumatic ever started... But that's just my situation; your's may be different.
Here's about 7 quarts full; flip that switch and empty that bad boy. I can do it in my Sunday best! Nice roll away, huh? Kinda dirty...
