Before I'm up(before it's my turn, it'll be your turn next(you're up next)

Question

A person is waiting outside a shop in a queue(a very famous shop) get the famous shop to get the world famous sweets. So he says:

1.They shouldn't run out of sweets before I'm up.

2.They shouldn't run out of sweets before it's my turn.

What sounds better option 2 or option 2?

And what about other contexts:

I'm up next.
It's my turn next.

When am I up?(or when are you up?)
When is it my turn?(or when is it your turn?)

It's your turn.
You're up now.

Answer 1

You use the word queue so I imagine you are asking about British English, not American - they would say line.

Normally we say, "I'm up next" to refer to a formal performance or hearing.

Examples

He is up next before the judge on a charge of theft.

She is up next in the auditions for the new musical.

John is up next to receive his graduation certificate.

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When you are talking about a queue you should always say, it's my turn.