미안(죄송)합니다 >미안(죄송)해요 These are polite one. 죄송 could be more polite. And the first one could sound more polite. 미안해, 미안하다>미안 Theese are friendly one. Last one is the most friendly one. Kind of complicated. But we have to know them. If you say 미안 to someone who is much older than you. You'll be in trouble. And if you say 죄송합니다. to someone who is much younger than you, you'll be .... kind of in trouble too. Sometimes we do that for teaching. Like, if you are kindergarten teacher maybe you'll say that to kids for teaching.