I dont have any experience with the sigma, I have a P95, and I don't like Glock ergonomics.
Ive had my P95 for a few years, its been great. It eats any ammo I feed it and is solid as a rock. The only time I had an issue with my ruger was new out of the box. I tried firing new right out of the box and it was a little too greasy, it would stove pipe every few rounds. After the 1st cleaning it has functioned flawlessly.
One thing about the ruger is the de cocker, I liked to carry it with a round in the chamber but the hammer down.
Right now my favorite handgun is my M&P 45, I put a fiber optic front sight on it and its a blast to shoot.
My advice to you is to save up a little more and get the gun you want + extra mags/ammo and a handgun safe.