What are the best brand rewards programs in terms of value for dollar spent?

I am a rewards enthusiast and was wondering what some of your favorite rewards programs are in terms of value per dollar spent?

FYI - I spend most of my money at supermarkets and pharmacies, with the occasional clothing store (Nordstrom Rack is my go to). I also do fast food (i.e. Chipotle is my fave).

Does anyone have any thoughts? Thanks!