That's a really nice display, but it's nowhere near the size of the largest Sonic poster made. That honor goes to this behemoth: 12 feet high, 6 feet wide. As for my personal favorite posters: But my absolute favorite poster isn't really meant to be a poster. It's an old puzzle from 1993 which I have framed and hanging on the wall.
My biggest is the old original Sonic 1 poster that came in the case with the game...still got it, still in perfect condition and now behind glass on my wall above my desk~ C: