kydex for sure. man getting to 50 post takes for ever lol. i cant wait to get this baby in the classifieds to see if anyone wants to trade. im not sure i can wait it out before i start shooting it lol.For inside the waist band carry you have many options, especially for the G19 where you can find many models molded just for this gun.
Depends if you like leather, kydex, both leather and kydex etc.