It is extremely rare that MFS is better, especially if you live in a Community Property State. For example, you both must elect the Standard deduction, or both must itemize. And some tax credits are not available to MFS. Further, if you file as Married Filing Jointly, you cannot amend to Married Separately after the filing deadline (which happens to be today, May 17, 2021) has passed. Also see:
Should You and Your Spouse File Taxes Jointly or Separately? - TurboTax Tax Tips & Videos (intuit.com)