Would you rather be able to turn invisible, or be able to fly?

I would definitely rather be able to fly.
While I would love to be able to turn invisible and do all sorts of cool things, I think I would end up in a big mess, I would abuse the power.
I was talking about that to someone who'd rather be able to turn invisible than fly, and they said "Yeah, it's not such a big problem for me 'cause I'm not a Christian."
I was talking to him again later, and he said that if you ever want to reach out to someone who's not a Christian, don't call them 'un-saved'. He's been to his sister's youth group a few times, and when he'd talk to people they'd say things like "Oh, so you're unsaved."
What the hell? It just turned him right off, as I'm sure it would turn off anyone who wasn't a Christian.
How would a Christian feel walking into a group of 'un-saved' people if they all said "Oh, so you're a Christian."?
I would hate it.
People are making too much of an 'us and them' of Christians and non Christians, and it's the opposite of effective.