Mine's without a doubt the ugliest gun I own. A Japanese Arisaka, Type 99, that my dad brought home from Guam in WWII. Second choice would have to be the Marlin 49DL he gave me when I was a teenager. But I really can't count that one anymore since it really belongs to my son now and only resides in my closet.
Is it odd that in a handgun forum so many have selected a long arm as the favorite gun in their "arsenal"?
If I had to choose a handgun it would be my Smith Model 19-5. The one I have shot the most, however, is a stainless Colt 1991A1.