That's easy. When I go to my safe, I pull out my P226. It's a West German Herndon-marked gun, proofed in 1988 and I bought it new in '88. I have umpteen-thousand rounds through it--Gunsite twice, it was my IDPA gun for years--and it's never, ever failed. I had it Black-T'd back in 1999, and the slides moves like it's on wet ice. I shoot it like an extension of my arm. I say, "This is my favorite," and then I put it back.
...and see my P229. Oooo, this is a great gun. The Hogue aluminum grips give it just a perfect purchase in my hand, and although I bought it as a like-new CPO (for an insanely low price) in .357Sig, the .40S&W and 9mm barrels make it a whole battery in one gun. It points well, and has an unusually smooth and light trigger from the factory. What a great weapon, and totally versatile. I can stock up and shoot whatever ammo happens to be cheaper at a given time. I can shoot all day in 9mm, and then carry something heavier if I choose. I say, "This is my favorite," and then I put it back.
...and see my P6 (P225). It is a beautiful 1994 German (Nordrhein-Westfalen) turn-in that had seen almost no actual use. When I pulled the grips off, there were dust bunnies wrapped around the mainspring. It is light, slim, and because the triggerguard is undercut much higher than my P229, and it fits my hand perfectly. A lighter mainspring takes care of the heavy pull mandated by the Germans, and a new hammer, and flawless Black Cera-Hide coating make it look new. It is a favorite carry gun for reasons I can't fully explain, being a single-stack 9mm. I say, "This is my favorite," and then I put it back in the safe.
...and see my P226 again.
Sometimes I get stuck in this DO LOOP for a long time.