I suppose it's fun to speculate, but given that no one here has driven the EB and no aftermarket exists for it yet, that's all this is. While weight is an advantage for the EB, I expect gas mileage to go out the window when the wick is turned up. Longevity issues will take some time to figure out, whereas the 5.0 is proven. It'll be interesting to watch.
2014 V6 Manual