I always choose to return to a coffee shop because sometimes the air conditioning might be broke, the staff might be unwell, it might not be a good day...
After my first escape to the Backpacker in Phuket Town (although very convenient for Thai Airways Office and waiting for the bus) the coffee was terrible. I chose to visit there after a visit to the Por Tor Festival with Jamie in Phuket last year and the beer was cold, cheap and there was a happy atmosphere.
The coffee midday whilst waiting for the bus...
Approximate price: $$$$$