i bet their abrasion resistance would be good but what about their impact resistance ?
They would propably stay put against the blade better. I find mine can get a lot of snow built up behind them. I manage to hit something each year that bends back the wing a bit, I wonder how much these would bend to accomodate that. Or how they deal with curbs.
I been happy with the performance of my rubber edges and I think I would replace them with the same given the questions I have about urethane. To solid I think.