We have had many different brands of guns in our rental inventory, and only the Glocks have lasted and lasted and lasted.  We use Glock, Springfield XD series they have been ok but do not have the longevity factor that Glock has  Glock is so simple to use, and maintain, clean better than any other brand in the last 15 years.  They come in all sizes for everyone.  380, 9mm, 40, 45 357.