it's faster, for me, in this order; 9mm, 45acp, 357 sig and 40S&W. It can depend on the firearm weight and bore axis when dealing with more than one brand.
Glock 19 vs Glock 23
Average 2nd shot time based on both 1st & 2nd shot hitting a 6 inch circle at 6-7 yards.
Using +p 124 HST or +p+ Ranger T in the 19: about .25 sec
Using 180 gr Hydra Shok in the 23: about .26 sec
Hotter 165 or 155 gr in the 23 would increase time.
Glock 30 SF with flush magazine (no room for pinky) and 230 gr about .29 sec
9mm is easier by fractions of a second.