I don't think we'll know who "won" for a couple of years.
I'm a huge fan of Russ, and there are few if any QBs I'd want instead of him at the end of the game when you've got to score. But I have to acknowledge that he ignored half of the field (the middle half), that he held on to the ball when he had open receivers in the short/mid ranges in favor of the bomb, and that his Fran Tarkenton spin move now results in devastating sacks more often than miracle getaways. He's still a marvelous QB despite all of that, and if the Broncos really do tailor their offense around his strengths (and why wouldn't they?) then they'll have success with him. That's a win for them.
On the Seahawks side, they got a solid draft haul, and in the first year of that haul made what project to be major improvements on the offensive line as well as some much needed depth in the RB room with a guy that many said was the best RB in the draft. They also drafted some highly rated defensive prospects, maybe even an immediate starter. They got a solid TE prospect in the trade, and a QB that I'd rather kick the tires on than any in this year's draft. If that QB doesn't do well, they're in solid position to get a really good prospect in the next draft, and even the capital to trade up to get a great one. The Hawks also lost a player who was only going to be more expensive than ever to keep (whenever he signs a new contract it'll be the richest QB contract up to that point, until the QB after him signs).
Really, minus a crystal ball, this trade looks to be a solid one for both teams. If I could have a Russell Wilson who was genuinely enthused to be a Seahawk, then maybe I would feel differently. But I don't think that was an option anymore.