I have the Sigma Series 9mm and just would like some input from others out there. What material type do you prefer for conceal carry for your S&W? I have family members that have other brand full frame pistols and love nylon conceal holsters and love them, others have leather conceal holsters, and as of late have brands like Alien Gear. I was thinking to get a nice nylon conceal holster? Whats your advice on this? Thanks!