How do they compare in size? What do you like about each gun (advantages of one over another). I am looking at a new gun for carry, and both guns are getting great reviews. I really like the XD Compact, but I have yet to handle the HK so I can't compare the two. If I can't decide, I may have to buy both, and that would just be horrible. A side by side pic would be great if anyone has both. Thanks.