I cannot choose between the Model 915 and the 4506. The 915 is a nice do it all practical 9mm handgun that is extremely accurate and easy to maintain. I would have picked it over the Beretta 92F.
The 4506 is a hand cannon with a more modern and sturdier design than the revered 1911. If I run out of ammo, it is heavy enough to use as a club. Fun to shoot.