Well, if they have it actually proportionately reflect the population of each county (which is something the current system does totally NOT do with respect to the population of states), I suspect the result of the election wouldn’t have changed all that much…but at that point, wouldn’t be a hell of a lot simpler just to go to a direct popular vote?
It would be kind of interesting to figure out what the result of a “county electoral college” would have been…but extremely tedious to actually do, lol