Horizon is no doubt still the #1 sku for the year including digital. And it's retail sales have been huge lately with its $40 price point.
Zelda really should be beating it in the end but if Horizon replaces uncharted 4 as the standard ps4 slim/pro bundle this holiday and into next year it can hang with it in the long run.
Crazy to think a game by guerilla is challenging a pillar of gaming culture like Zelda.