Short answer: 1860 Army (full size).
BUT, I love 1851 Navy too. 51 Vs. 60? I have been wondering which is my favorite since I was just a little kid. Im no closer to a definitive answer than I ever was. Got to have both, no way around it.
I lean toward .44 though and Armys / Navys dont really compare anyway, at least one to the exclusion of the other.
If, in evil hour, I could only have one Colt (perish the thought and heaven forefend) Id just have to have me a 60 Army, boy howdy I would.
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Addendum: I did not mention 1861 Navy because in handle and caliber they resemble the 1851 and in front end form resemble an 1860 Army. An 1861 Navy may reflect the best of both of those other models. I only have one 1861 Navy and love it unconditionally. But Ill stick with my first choice of 1860, as conflicted as
any choice may be.