Both shot great. The Glock 19 is my wifes so I only shot one magazine through it but it shot well. The Sig P320 is mine and I put about 200 rounds through it and all I can say is that we mesh very well together! 2" groupings at 20 yrds. As for both guns being completely stock with no modifications, I prefer the Sig. The sights are better to me and the fit/feel of the grip is much better than the Glock. It has become my EDC.
Picked up a new IWB holster from Alien Gear (Cloak Tuck 3.0) and it is really comfortable. I just need to get used to a 5 o'clock draw. I have a bad lower back and it has been causing me some discomfort to have to reach back like that. I'm still adjusting my placement though and it may get better for me. I also might try another holster and placement but I wan't to give this one some time. A big help was getting an actual gun belt. It has made a huge difference on secure fit of the holster!