I have no experience with the Sig 226 9mm, or Berreta PX 4 9mm.
So I can not comment.
However I have both the Springfield XD 9 and the Glock 17 and both are great guns and will serve you well.
The Glock is a little bit lighter in weight than the XD, and are good guns so you can't go wrong. But I prefer the XD over the Glock because of the grip safety. Just one of them hold over things from being a 1911 fan.