Going purely by TKG - Time to Kill a Guy - ignoring chance factors like missing or headshots:
Thompson and Type 100
40 damage ; 0.08 Fire Time0.08 seconds to fire the second shot to kill with Power
0.12 seconds to fire the third shot to kill with Double Tap
0.16 seconds to fire the third shot to kill
-
MP40
40 damage PC, 50 damage XBox ; 0.112 Fire Time0.084 seconds with Double Tap on consoles
0.112 seconds with Power or on consoles
0.168 seconds for the third shot with Double Tap
0.224 seconds for the third shot to kill
PPSh-41
22 damage ; 0.048 Fire Time0.144 seconds, four with stopping power or five with Double Tap
0.192 seconds for five shots
The fastest-killing weapons are the
Type100 and Thompson, with an indistinguishable difference between them and the console-version of the MP40 using Double Tap. Given the kick and all that, the Thompson and Type100 come out on top over the MP40.
PPSh is much better at sending a tight stream of bullets towards a guy far away. Head-on, it would be clobbered by the other SMGs.
We've got our first non-True Bro.