PX4 vs K100 Rotating Barrels from Beretta and Grand Power

Ever wonder how Beretta’s PX4 compares to Grand Power’s rotating barrel pistols (K100 in this case) - he is a close up look at both options.
Are there any other makers out there with rotating barrel handguns?
Do you have experience with either - or both of these weapons - please sound off in the comments.
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