A. All ceramic will be good in various light conditions, if you spend time in cubs etc with UV light there is an advantage. Also if your lip uncovers the neck of the front teeth when you smile all ceramic is better. In most other cases it depends on the affordability. The PFM crowns are useful in patients with tooth surface loss / heavy biting forces as the non visible biting surface can be in gold alloy which causes less long term wear of the opposite tooth.
If you need a free personal assesment if your individual case, you can contact our office direct but mention the guide link.