I've nothing against the Luger pistol, but if I wanted a 9 mm, I'd get a Browning Hi-Power.
I've also owned both commercial and military P.35 Browning Hi-Power (BHP) pistols. My Browning commercial HP was made in 1955 and had a deep blued finish with European walnut grips. My military BHP is a WW2 Canadian John Inglis-built, No. 2 Mk I* pistol. The Inglis is nowhere as finely finished as the commercial BHP; it has a dark gray manganese phosphate finish, plastic grips, and a lanyard ring. The rear sight is milled as part of the slide and the front sight is fitted by height and windage adjusted to zero the arm at 25 yards. Of the two, I like the Inglis military BHP over the commercial Browning (Herstal) product.
The Browning Hi-Power is another go to war pistol for serious gunfights. Other proven go to war pistols are the Colt M1911A1 and Tokarev TT-33. These pistols use the three most common pistol calibers in the world: 9mm Parabellum (9x19, Luger), .45 ACP (.45 Auto), and 7.62 Tokarev (7.62x25).