They both face sweet matchups this week and it boils down to who will get the most targets. As RC said the past points to Sims-Walker but darn that Garcon looks good to me. If he looks like a beast to me I'd imagine he looks like money in the bank to Peyton. Tough call but I think you'll be okay either way.
I'll get back and confirm, but I believe Seattle has a bunch of injured D guys coming back this week. That could really change the complexion of this game. If Walter Jones is back as well it will be a whole different team