Honestly and I just stated this in the other thread discussing AR for HD and you mentioned the CX4.... I would choose based on if you had a 92 or px4 in the same caliber, or planned on it. You can buy CX4 with either mag, and you can share your mags with your handgun.
Just food for thought anyway. Either caliber is serviceable, I would go buy purchasing or already having the matching pistol.