I'm debating on prescription sun glasses or contacts with regular sunglasses

Contacts, and don't be a twat and get them colored.

Can..can I get cool designs on them? : D

no.

Both.

My glasses have photochromic lenses, which work great for me.
But I wouldn't be opposed to having prescription sunglasses. I'm not keen on contacts myself due to how they feel; but you might like them more.