Freestyle to stock up, and Samy's to replenish. Freestyle is across town, but Samy's is very close. Freestyle has better selection, significantly lower prices, and employees who live and breath film. Samy's is more oriented toward equipment (including rentals), and has a limited selection of film and chemicals. However, they have a fine staff of employees who are very helpful and friendly, and they have the very basics on hand if needed. I have never had any customer service issues or even any mistakes there.
I go to Pix if I need something after Freestyle or Samy's closes. It is primarily a rental house, so someone is always there on the rental side. You just have to call up and ask them to open the door for you, and the rental clerk will let you go over to the film side and get you what you need.