I would guess that 95% or more of 9mm loads are hotter than 100% of .38 special loads.
Pressure in 9mm is far higher. Interestingly the 9mm makes a pretty decent revolver load. Using full moon clips it is quick to reload and performs well in short barrels.
I know,I load thousands of rounds in both caliber every year.The new .38 loads are nothing to sneeze at,the 135 grain gold Dot load intended for short barreled .38’s is probably the nastiest .38 load out there.I carry them in my .38 Detective Special-as my back-up gun.My main weapon is a model 19 or a S&W MP in .45.