Glock 23 v.s. 40 S&W?

I own a Smith & Wesson 40 Cal. I found a used 2nd generation Glock 23 at a pawn shop. The Glock has night sights with it and uses the same ammo that my S&W has. I was wondering what most people would rather use, the Glock or the S&W? I'm thinking about trading in my the Glock but wanting some other opinions.