Science has nothing to say about whether something is aesthetically better than something else - that is the job of philosophers, poets and artists. However, science does have something to say about which eye color may be better physiologically.
I've written in the past about intra-ocular light scatter, a phenomenon that results in blue-eyed individuals experiencing more glare because their blue eyes do not absorb enough light. That's one drawback to having blue eyes.
Another drawback to blue eyes is that, according according to the National Cancer Institute, light colored eyes are a risk factor of iris melanoma, which is an eye cancer.
People who have this procedure done should do what all blue eye individuals should do, wear anti-glare lenses to reduce the glare and wear UV protected sunglasses to keep sunlight and UV radiation out.