If you are doing this in TurboTax you should come to a screen that looks like the attached screenshot that will tell you which way to do it.
If you plan on filing in the future as Married Filing Joint, then it will not really matter if you split the amount or if one person pays more and one person pays less. However, if you will ever file as Married Filing Separate then you will want to be sure each of you are having enough withheld to cover your individual tax liability.
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