If I could only own one of each at a time, and had the chance to sell them and buy another (and they were given to me), I'd go with the following:
-Walther PPK from Dr. No.
-Some old, valuable Remington Model 12 with historical significance, I dont know...
-Carlos Hathcock's Model 70 .
Then, I'd sell them, pocket the money, and buy the following:
-Glock of some sort.
-Remington 870 Wingmaster (not really into shotguns. Are these reliable?).
-AK-47. stick a pipe bomb inside and it will still function.
I want reliability.