no way to tell for sure unless you do 3 returns. MFS - you, MFS - spouse, MFJ. since you are married, you can't use HOH.
an online account can only hold one return for any tax year. so you may need the pc or mac desktop version. which allows for multiple returns.
note that if MFS, most credits are not allowed.
also note that if MFS, if one itemizes both must itemize (no taking the same deduction on both returns), if one takes standard deduction both must take standard.
as I said, no way to tell for sure, so I'm guessing, but most likely you'll find MFJ is best.