Suppressor guidance

Wondering if there is any good reference for buying suppressors. I have a few and some seem to have little to no difference like a 9” bannish to a 9” thunderbeast but I have also bought a cheap one like the dirty 30 it was called and it is a wast of money. Little to no sound suppression. With them becoming more popular wondering if anyone has a good resource other than marketing info from the company’s that I do not believe.

This YouTube channel seems pretty legit, he pretty straight shooter on info doesn’t really seem to push any cans, and just side by side comparisons