What sandals are good for plantar fasciitis and heel spurs?

They aren't! The best shoes for a person with plantar fasciitis are those that have a sturdy back to them, which sandals don't have. You want a supportive shoe that cups your heel and holds it steady. Sandals tend to allow your heel and arch to function in whatever position it wants to, which might be what caused the plantar fasciitis in the first place.
None. Most sandals lack proper support and cushioning. If you insist on a sandal you need one with at least a 1/2 inch heel.