As an optician, I notice that the Varilux Comfort is easier to adjust to and is more comfortable for patients.
I've worked at two different places, one a private doctor office and another at a chain optical.
For first time progressive wearers, both are fine, however if you were to change a varilux comfort wearer to an Ovation, it's a little more difficult for the patient to adjust to.
Most places sell the ovations more and pushes it more because they can surface it in house and make more profit. Working at a chain optical, our commissions were more if we sold Ovations, therefore, many salesmen lied to patients saying it is identical.
Varilux is definately better, but there are many other lens that are much better than Varilux comfort.