Are you a hi or a hello person? Or something else entirely?

Depends:
"Hello" or "Good Morning/Afternoon/Evening" - express deference or with people I don't know
"Hi" - more casual, for coworkers or acquaintances
"Hey", "Yo", or "'Sup" - with close confidants
"Greetings" (with an over-pronounced T, I'm American) - flying the weird flag