I ran 40 for a while, did a comparison w my bro in law. He ran a sig 226 9mm,w 155 gr rounds, i ran a 226 in 165 gr 40,...I did better running the 9 in speed and target acquisition. He agreed, did thesame and felt the same. I like the 40 power, but i don't want to spend time screwing w loads to get 9 mm type recoil and consistency out of a 40.
Factory ammo for a 9 has been less, so I decided not to fix my stuff till it was broke. Today I run 9mm for 3 gun,everything else is 40 for work.
HTH