Here's a store poster for Sonic Adventure 1 (At left). It's set up in a more 'art' way than an advertising way without tons of text or screenshots & flashy headlines. It has that 'circle' Sonic, the logo & square portraits of all the characters across the bottom. There are still headlines (vertical red, smaller black) but with the somewhat abstracted background & giant Sonic art, it comes across as more 'poster like' than 'billboard like'. 

To the above-right you can see the variant of the Sonic Adventure 1 poster. This one has the noticible difference of the black band added at the bottom. It has the release date, tiny texts, and 4 screen shots of the actual game. This one is more of an 'advertisement' type poster . Everything else about it except for the line/it's content is the same. The poster without the bar is smaller & rare-er than the other.