Post Covid-19, will SF still be the best place to start a startup?

Remote work will likely continue trending, but the Bay Area will probably remain a hot spot for venture capital for some time.

There is no best place for a startup. Only a reliable labor pool to grow your business. The bay area has enough new companies so that taking a risk going with a startup does not kill you financially when it goes belly up as most of them do. Therefore the labor pool exists. Other places not so much.