Everybody pretty much knows what an AR can do over an M90 given whatever bolt-on or level of modification. Having said that, it wouldn't be fair to compare an M90 running 20psi to a motor running a ball bearing T-76 with 20psi. Boost isn't just boost.
Whenever people go about comparisons between a blower and a turbo they end up making a complete apples to oranges comparison. "Oh my M90 only ran 13.80's so i built a good shortblock and put a T-88 on it running 35psi with methanol as fuel, etc..etc..." Yeah this is about a stock longblock, but I was just sayin....
If a supercharger doesn't make as much power as a certain turbo, then all it means is it's in need of a larger, or more efficient supercharger. You would do the same with swapping turbo's, no? Superchargers rely more on the volume of the whole intake system (heads and intake manifold) to make power, whereas a turbo will band-aid lack thereof.
In the Big Block world, not exactly drag racing, people think of turbos and superchargers as equals. Put an 8-71 on your 800HP NA Big Block Chevy running 10psi and make 1500rwhp. Same with a certain sized turbo.
Before someone makes a rash conclusion about the two, compare apples-to-apples. The difference between each unit isn't what they are, it's the difference in volumetric efficiency, which is a direct correlation of adiabatic efficiencies.