You really have to experience both guns yourself.
If you are 61 years old, have better than 20/20 vision in each eye, but presbyopia and cross dominance. If your hands have a large palm with average fingers, if you work out so your hand strength is better than average, own what I own.
Both SIG and CZ have superb reputations, with many adherents. After having owned several handguns, I just bought a SIG P226 CPO. The sights, the grip, the trigger pull and feel, the weight and balance of the gun are what I've been looking for.
You might want to try a single-action 1911. The Internet has many thousands of words debating the merits of this gun--but you should experience the trigger. It's unique and very, very conducive to accuracy.
A new SIG costs hundreds of dollars more than a new CZ. A SIG refurb is still more expensive than a CZ Only you can decide if it's worth it. Consider what you'll be using it for. What accessories do you want for it? What sights are you comfortable with?
Don't forget the feel, the looks and sounds. Shooting is an aesthetic experience, too.