You are considered as a nonresident in 2020 and required to file a Form 1040-NR. As a F-1 visa holder, you will be exempt from counting days for five years, 2016-2020. Starting from January 1, 2021, if you meet the Substantial Presence Test SPT, you will be considered as US resident and file a Form 1040.
As TurboTax does not support nonresident filing, you are advised to contact Sprintax.
First year choice usually applies to taxpayers who switch from F-visa to H-visa during the same year. This choice will allow them to file as dual status. For more information, click here: https://www.irs.gov/individuals/international-taxpayers/alien-tax-status-first-year-choice
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