M1911 should've been the best pistol in the game BUT thanks to the horrible hit detect... Most of the time, your gonna only kill 1 guy when 2-3 guys stands infront of you.
MP-443 Grach ideal for killing 2-3 guys even with hit detect failing. Plus it reloads faster than M1911.
M1911 7 bullet mag, slower reload, slower rate of fire, slightly more dmg.
MP-443 Grach 17 bullet mag, faster reload, faster rate of fire, slightly less dmg.
All in all, both are good but if the first 7 shots on target fails to hit(hit detection rubbish) you would still have 10 bullets to play with if you were shooting with the MP-443 Grach in the first place.