Many considerations here: pure sentimentality, function, looks, economy, or any combination of those and many other factors.
As much as I like the black rifle, I think mine is the M1 Garand.
First real semi-auto produced in massive quantity; used to great effect in WWII (quite possibly a deciding factor), ooooh WOOD; that cool sound the clip makes on ejection; powerful (30.06!)and accurate; the list goes on.
Let's hear it!