I've owned over 10 handguns in the past 3 years. This includes Glock 19, 27, 26, S&W .357 revolver, XD.40, XD.45, Kahr pm9,Walther P99 .40, H&K USP .40 Compact, Ruger LCP, Colt 1911, Kimber UCII, P2000sk 9mm....in that exact order.
I own 3 today, and don't regret selling the rest one single bit. The ones I still have are the H&K USPc, P2000sk, and the Ruger LCP stayed for pocket carry. In all honesty, I've never shot the Kimber but decided to throw it up for sale before even putting a single round through it. The reason? To buy the P2000sk
As you can tell, I like trying new things. However, the H&Ks were my last stop. They stood above the rest and really made an impression on me. I'll NEVER get rid of them. I won't miss the others a single bit.
I have never owned a Sig. They are great guns. I just never got around to buying one. I say keep the Sig, and ditch the Glock. Of course, since there are a billion glockaholics lurking this forum you are going to get the "keep the Glock!" responses. The best advice, however, is to keep the one that you enjoy shooting more. Good luck!