Firstly porcelain is a type of ceramic rather than being a separate enmity in its own right.

Secondly as to whether I would recommend Empress veneers. There are basically 2 types of porcelain veneers commonly used today – empress and feldspathic. Empress veneers are far stronger ( 3 to 6 times as strong) as feldspathic veneers as they contain a large amount of a substance called Lucite. However feldspathic veneers are generally more aesthetic due to their light properties.
If a patient has a strong bite I would be more inclined towards empress veneers where as if aesthetics were my only concern then I would be more likely to chose feldspathic.

Another consideration is how minimal I want to be in preparation of your teeth. On the whole technicians who make veneers tend to need more room for Empress veneers than feldspathic veneers and so my preparation of your teeth would have to be a little more for an empress veneers than for a feldspathic veneer.

And finally to completely confuse you Empress veneers are often overlaid with feldspathic porcelain to improve their aesthetics.
At the end of the day you need to find a dentist who truly understands material science to give you the right option for veneers for your teeth.