I have carried a SIG P228 9mm for more than 20 years. However, a few years ago, I went up to the .45 ACP version, the P220 Carry. I love both guns. I shoot the P228 more accurately, but that is to be expected with a 9mm versus a .45 cal.
Then, last year, I acquired a Glock 17C. I have always disliked Glocks. Always. But I lightened the trigger on this one and put Trijicon night sights on it (with an orange front sight) and "Whoa, Nelly!" This is the most accurate gun I own. I still don't love the Glock -- it's like owning an ugly dog. It's loyal and dependable, but still awkward and uncomfortable. But you can't argue with single hole accuracy right on the X.
On Saturday, I took a new SIG P320 Compact to the range to compare it to the Glock and some other 9mms. The P320 is a fantastic gun. SIG is giving Glock a run for its money with this model. I highly recommend that anybody considering a high capacity 9mm give it a look.