What size is the space on the wall you want them to fill?
FWIW both of them would work in either canvas or as a normal framed print. Obviously for the given size on the wall a print will have the image smaller than a framed print when you take into account the mount and frame.
FWIW my personal preference is a nice print of fine art paper.
Sorry, For What Its Worth, internet abbreviation.
IF it is to go above a piano, I think a decent print in a frame made out of the same type of wood as the piano would look pretty good!
That would probably work, plain off white backgrounds look the best I think.
thing a4 picture or a4 frame lol sorry ill leave you alone