Differences between standing and sitting (picking angle)

OK I’ll give one a go, anything that helps me with learning to play in different positions is good.

Thanks @WhammyStarScream, I’ll have a look.
I nearly bought a JEM from ebay last year but I couldn’t go through with it, I just couldn’t bear the thought of buying a guitar I’ve never played.
Something like a Washburn or a Charvel with a Floyd Rose from the 90s would do me fine.