Where to find the best croissant in San Francisco?

This is hard to say as the answer heavily depends on your preference. Arsicault is generally a very popular bakery for croissants. The croissants here are very flaky and very buttery. If that is right up your alley, definitely give them a visit! Other than Arsicault, there are many bakeries in SF that offers croissant with a creative twist. A couple examples are Hahdough for pretzel croissants and Arizmendi for sourdough croissants. Personally, I prefer my croissants to be not too buttery but moist in the middle and crunchy on the outside. My personal favorite is Schubert's Bakery in Inner Richmond. The price point and taste well align with what I am looking for!