I have both an XD45C, two in fact, and an XD9SC and although there is a difference in the length of the grips I don't notice it that much. Depending on where I'm going and what I'll be doing I'm as likely to carry one as the other.
I was giving the XD45 preference over the XD9 because I figured if I'm can only carry 10+1 rounds I'd rather have the .45. However since I learned the XD40SC mag fits the XD9SC perfectly and will hold 13 rounds of 9mm I tend to carry the XD9SC more. The XD9SC with 13+1 is definitely lighter to carry than 10+1 in the XD45 and I don't feel any handicap in carrying the 9 instead of the 45.
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