Are these both ok?No one is sure about the exact date. Some say it’s on the final days of ...
Are these both ok?No one is sure about the exact date. Some say it’s on the final days of January while/but others say it’s on April 1st.

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Question

Are these both ok?No one is sure about the exact date. Some say it’s on the final days of ...
Are these both ok?No one is sure about the exact date. Some say it’s on the final days of January while/but others say it’s on April 1st.

Thanks

Answer

Native speakers in the US use both “but” and “while” in this context.  They are both OK.