If youre on a really tight budget then there is something to be said for the savings in lead and powder for the .36.
That being said... '60 all the way!
Its a more advanced design, especially where on the gun loading is concerned. The .44 is no slouch, even in black powder. And, for ME, it is simply a more elegant weapon then the '51.
Just as there is a REASON the world moved from BP to self contained cartridges, there is likewise a REASON that many moved on to the newer and more advanced 1860 when it became available.
Hey... Whats wrong with one of EACH???