J1 visa exchange visitor
I'm on a J1 visa since June 2017 (first as research scholar (2017-2019) and now as alien physician (2019-present). I filed my 2018 and 2019 taxes with turbotax (previously was not aware I cannot file on j1 using turbotax). Do I need to amend both 2018 and 2019 return and send two Form 1040-NRs using sprintax? Also, for this year taxes, which one to use- turbotax or sprintax?