What are the key points to look at when comes to choosing a PD?

Few factors. 1. Proximity to Home. 2. Cleanliness of Clinic. 3. Warmth of PD 4. Clinic Assistants. If you can find one that matches all 4, stick with it. :) I use 2 diff PDs for different scenarios but prefer Kinder Clinic Parkway for more serious ailments.