Each type of dental crowns have their pros and cons. Porcelain and Zirconia crowns are white/tooth coloured, which makes them more aesthetic, but metal is stronger and does not break. Essentially, gold crowns are considered the best as the wear resistance of a gold crown is the same as a tooth but unfortunately, they are not cosmetically acceptable these days. Zirconia crowns are harder than porcelain crowns but a bit opaque in colour. Porcelain crowns are very good for aesthetic areas like front teeth as they match the translucency of natural teeth. Sometimes, a layering technique is used which means we use 2 different materials in one crown. For example, this may be a metal or Zirconia layer under and a porcelain layer on top. This way, you have the hardness and stability of Zirconia or metal which isn't visible thanks for the external layer of porcelain.
Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.