If you want to read all of Superman's story you have to collect different issues from dozens of different series, limited series, books that are out of print, crossover issues from other lines, etc. If you want to read all of One Piece you just buy One Piece volume 1 and start from there.

If you want to read all of Superman's story you have to collect different issues from dozens of different series, limited series, books that are out of print, crossover sisues from other lines, etc. If you want to read all of One Piece you just buy One Piece volume 1 and start from there.