All-on-4, acrylic or or zirconia porcelain?

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The hybrid zirconia and acrylic prostheses actually have the following difference: zirconia prostheses are characterized by being the most resistant and aesthetic prosthesis material, however acrylic prostheses are also aesthetic and resistant but not the same as a prosthesis in zirconia
I can tell you that I have received patients in my practice with prostheses on hybrid acrylic implants that have been in the mouth for more than 20 years and are very well, but there are patients who have zirconia prostheses and do not last for 10 years due to lack of dental hygiene. 
The two treatments are very good and I recommend them both, but I also recommend the patient a maintenance with the dentist every 6 months. 

There are two good options for prosthesis after All-on-4 implant placement. Both prosthetic options has its own advantages and disadvantages. It's better the clinician takes the final call on what is suitable for you.
Acrylic wrap around is very lighter and cosmetically appealing too, but it wears out slowly over a period of 5-10 years and needs only the acrylic part replacement, which isn't expensive at all. The titanium framework inside doesn't need replacement. People with poor bone quality, shorter implants and very elderly, I personally suggest acrylic hybrid as an option.
Zirconium porcelain prosthesis is definitely stronger and long lasting. They look natural too, but they are heavier, ceramic chip-offs do happen and it can also cause wearing-off of the opposing natural teeth or acrylic teeth many a times.But my personal suggestion is that for people who are more concerned about aesthetics and also younger age group should opt for this Zirconium Ceramic option.