I would say the 9mm Beretta. I am not an expert so someone else might not agree but that's my opinion.
They both have their strong and weak points. One of the biggest problems encountered with the M9, function-wise, is the crappy aftermarket magazines. However, with proper factory magazines, and Beretta 92/99 series pistol (as well as the Taurus PT92/99 series) is very reliable.
Advantages of the M9 include:
Disadvantages include:
Advantages of the M1911 include:
Disadvantages include:
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