Hmmm. Kinda like saying which kid is you favorite. But I will try.
Favorite - Beretta DT-10 because I am really into clays at the moment. But I also really like my Remington 700 in .264 Mag when I am deer hunting. Or the old Colt 1911 (not 1911A) because it has a lot of history, or my old ruger 10/22 because it reminds me of my youth when the gun and I were inseperable. Or the Kimber Stainless Target because it is so fun to shoot. The list goes on...
Least favorite - Maybe a Remington 1100 20 Gauge Skeet because it does not fit me, but it is a great gun when I find a kid that wants to try shooting skeet with me. I had a 682 Gold E that did not fit well and beat the snot out of me, but it was a pretty gun and I had no trouble finding a buyer. Or maybe my 70 Series gold cup because I don't like to shoot it (even though I want to) because it has less than 100 rounds through it and the bluing is still in tact on the bbl. Or maybe RRA predator pursuit -- because I can't hunt ground hogs with it in PA.