I'd have to say buffalo nickel. The design has been repeated multiple times, and I haven't met someone who doesn't like them. I think Lincoln's are popular simply because they are less exPensive and readily available. Personnaly I don't like the design of Morgan dollars, theres really nothing to them IMHO
You haven't met me yet. I have a set of them but the only reason I put it together was because I already had built sets of Jeffersons, V nickels, and shield nickels. I really had no interest in the buffalos but I figured I might as well put a set together so I would have all of the nickels. I have to admit the did a good job reproducing the design on the gold bullion pieces, but they butchered it on the silver dollar.
For collectors I would say Morgan Dollars and Educational Notes. For the public I would say Lincolns and silver certificates. Myself I would pick Braided Hair cents and National Currency.
Aren't you really looking for the "consensus" choice, not a non-existent "unanimous" choice? Merriman-Webster Dictionary: At least when I went to school (pre-texting environment] "most" and "all" were considered different words/concepts.