The thing about art is that assessing it is an inherently culturally-bound and personal taste bound endeavour.

Which is the better piece of art:

1. The Mona Lisa

2. The Great Wave off Kanagawa

This will inherently be subjective as there will be so many biases that come into how we assess these things.

However, which is the better piece of engineering:

1. The first plane built by the Wright Brothers

2. A modern 737

By any reasonable analysis it is the 737. It is objectively more complex and indicates a far greater achievement both in its own creation as well as the civilisation that was sophisticated enough to build it.

Engineering has an objective standard you can compare things across, art doesn't. This isn't to say art has no value, life would be so much poorer without it. And they can certainly intersect in something like an iPhone which is both beautiful and amazing engineering.

However, there is an objective point where we have to ask: does this grant the civilisation that built it a greater control over its environment and its capacity to solve problems and this objective standard is what makes a lot of engineering so impressive.