You will almost always get a larger combined refund filing married filing jointly than filing two married filing separately tax returns. See this comparison for some of the reasons why: https://ttlc.intuit.com/questions/1894449-is-it-better-for-a-married-couple-to-file-jointly-or-separ...
The only way to know for sure is to start two new online accounts and prepare a married filing separately return for each of you and compare the results with the married filing jointly return.
