Not sure if I should buy a p320-18 or stick with Glock

I currently have a Glock 17 and 19. I have been looking at getting something else. Like a p220 or p226 but then I realized that mean I have to buy all new holsters, magazines etc.I thought about the M18 because the army but I’m not sure when my MP unit is gonna be switching over to that weapon system. Also, does Gen 5 Glock need new holsters and magazines or do Gen 3 mag and holsters work? via /r/CCW https://ift.tt/2ZmXd8o