What I've noticed is that everywhere else I use banner it prints vertically, at 90 degrees if you will. This is so you can print long banners on a printer. Why it prints horizontally on opus I don't know. I have found no command option to control that. I'm not sure if that's the "difference" you were talking about but that's what I see.
A while back I did a google search on banner. The gist of what I saw was that banner is not very flexible and there are other programs out there that let you have more choice on the banner output. I don't remember the program names.