That is something that really could only be answered by seeing the actual figures. In normal circumstances, TurboTax will advise you to take the deduction that gives the highest refund. Since it is telling you to take the SD, there is probably some threshold limiting what you have claimed.
For example: If you are under the age of 65, you can only deduct total medical expenses to the extent your expenses exceed 10% of your adjusted gross income for the tax year. Any medical deduction over that threshold would not be applied.
Normally there is a charitable deductions threshold, but that was suspended for 2020. Where some of your medical expenses paid from a health savings account. That could be make a difference. Go through them carefully and look up the tax limitations for each one. There is a reason why TurboTax is recommending SD.
