That's a hard choice to make. My wish for you is that you give yourself the gift of both.
At San Marco you'll see the world's best collection of Fra Angelico works, enough said.
But then how do you pass up Michelangelo's Day, Night, Dawn, and Dusk at the Medici Chapel? Contemplating the sculpture Night does make one think about Michelangelo's masterful depiction of the male nude versus that of the female nude (footnote: you've probably heard the theory that his models were exclusively male, and other theories as well).
You have a good list going. The wonder of Florence, where (arguably) the Renaissance started! Geniuses walked the streets of Florence for two generations. Like the Golden Age of Athens. Enjoy!