Since you are certain you do not have any carryover items that will affect the order of filing your returns, it may still be beneficial to complete the 2019 return first if you choose to use the CD/downloaded version of TurboTax for both years' returns. However, you may want to actually file the 2020 return before mailing your 2019 return.
If your 2020 return is processed and you receive your refund, then you would have the funds available to send your 2019 balance due along with the tax return. It is almost a certainty that the IRS is still behind with processing mailed returns, so actually filing the 2020 first could be an advantage.
If carryover items had been involved, filing the 2019 first would have been more important.
@Emc1122
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