I agree with @xmasbaby0 your best and cheapest choice is desktop software provided you have a computer on which you can install it. considering how amt is figured, you only get 1/2 the exemption MFS, so I would be surprised if MFS was cheaper but!. for MFS if one itemizes both must itemize or if one uses the standard deduction both must use it
here are links to see if your system meets the minimum requirements
windows
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
mac
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
