Should I use a standard mileage rate or actual expense method? (old and new car)

I received 1099 NEC forms from Uber, Lyft, and Amazon. I used 2 cars, one is an old car that I used until Sept, then a new car until the end of the year. What is the best method for me to use for my old and new car? If I use the standard mileage method, I do believe I can't depreciate my car because it’s already included in the standard mileage rate.