Replying to Cork differences

Over the weekend a couple of sick locals where throwing down cork 7's and 9's. I was wondering about the difference between the two 'corks' both of them where parrell to the ground...(duh it's cork) but one of them was rotating on the axis of his head straight back and the other had his head sideways. I don't throw these tricks down( wish I did) but i know on trampoline I am that sideways cork spinner. Does someone wanna clear up the difference or is it just different styles?