Keep the one that is the most reliable and you shoot the best. If you love the Sig and it has been the most reliable and shoots the best, then keep it. If the Glock is the most reliable and it shoots the best, keep it. If they both are the same as far as reliability goes and you shoot them both fairly well , keep the Sig since you "Love" it. You never sell a gun you love; though, reliability trumps "Love" every time.
Also, ask yourself this. If the stuff was to hit the fan tomorrow, and you could only take one gun with you, which one would it be? That should give you the answer to the one you should keep.