OR
Do you like killing a seasoned wastelander, who's carrying a sweet gun he's used to conquer many foes, thus making it your own?
Basically, do you like your own modded weapons, or unique weapons? Personally, I can't let my scoped hunting rifle go. Even at level 50. I have the other too modds for it too, but I think one of the best things added in New Vegas was weapon mods.
Don't get me wrong, I love unique weapons, and have made it my own little quest to acquire all of them, but there's something about weapon mods for me.