IMO, the MP5 > UMP45 in CQB situations (60% of the engagements). The gun recoils in a circular path and has an especially accurate hip-fire when combined with steady aim. The UMP45 has an erratic recoil that makes it hard to kill someone with automatic fire at mid range since the primary advantage of submachine guns, maneuverability and fire rate, is lost. The extra stopping power of the UMP45 is not going to help that much when the MP5 can pull off more bullets when going from sprinting to shooting.
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