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[We all/All of us] know the success of this project determines our year end bonus.

I'd would like to take this opportunity to thank [all of you/ you all] for a great quarter.

Which choice is more idiomatic?

Thanks!
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New2grammar
[We all/All of us] know the success of this project determines our year end bonus.

I'd would like to take this opportunity to thank [all of you/ you all] for a great quarter.

Which choice is more idiomatic?

Thanks!

My initial reaction is that they are probably equally idiomatic.

I prefer to use "we all / you all" because I do not like to use "of" in conjunction with a"all'. [All the people are here, I like all the children, etc.]

In my head, "of" means "a portion, part". [Five of the people were absent, some of the children are nasty, etc.]
Comments  
Philip, thanks for sharing what you think of 'of'. Actually, that's what I think too. However, I often hear native speakers use 'all of us' and it really confuses me. Can you think of an example that 'we all/you all' doesn't work as well as 'all of us/all of you'?