I would go with Polaris, you're asking if polaris is worth flying an economy seat in the back of the plane or an economy seat in the front of the plane...
Polaris definitely better than Austrian, on 767 everyone is in their own row. Swiss lounge is nice, and in TLV there basically no difference, I would imagine you would even get the title of "business" in terms of elite check in, etc.. If it were lay flat then there would be what to ask about but being that its just a matter of where the seat is on the plane i would not think about it too much.
Also I think to EWR Austrian flies a 777 with no throne seats though i dont know that for sure.