Which is more important, art certification or a person's ability to do creative assignment in an ad agency?

I think both the same for example a company is not looking for certification mostly the interviewer will think they tampered the certificate.. graphic design skills is everything is possible specially in print works.. so the best way to sell yourself if creative skills. certification is a supporting document ..

creative assignment Lead us to the outstanding work certification or a person's ability Lead to stereotypical Non-creative thinking This is desirable in agencies

The importance of your ability in innovation, flexibility and creativity and aesthetic art is what Ajdb the recipient thee