The B-78 and 1885 are basically the same action.

I recommend the Ruger unless you intend to use the rifle for Black Powder Silhouette or similar competition that requires a rifle with an external hammer. The Ruger is the only one of the three with a real safety. The other two only use a half-cock position for the hammer and the rifle can discharge if the hammer accidentally slips while moving it to the half cock position.