I'm still thinking about it looking at my watch and at the pictures of the gen. And I know now.
Yes, it's true that gen has the blue AR. So does the rep. But there IS a difference! The blueish tint is not the problem but the transparency. The gen crystal is blue and wonderful clean and transparent. The rep is blue and foggy. THIS is what is wrong with this rep.
I think that if this rep had the same AR as Sinn U1 rep it would be just perfect.
So... who is doing such blue and transparent double aftermatket AR?
Well my AR round will be hopefully done soon, some limitations but I try to make it happen also for bigger crystals, and my coating is super transparent and bluish. You know, I have 3777 too and I want to get it coated

My AR is about 1:1 to genuine Omega newest AR so I know that at current state 3777 rep is nowhere near it.
The difference in ARs is that both can be bluish but the other has 92% transmission of light and the other 98-99% in the visible light region. That is why the other looks better.
Here you can see my AR color: