Tough one here. I think you would be good with either one, but leaning more towards Decker. I can see New England and Denver putting up a lot of points, with Denver possibly even having to catch up. Plus, like somebody else mentioned, Decker has teh better QB. Also, after that huge week last week, I can see defenses zeroing in on Hartline more, where as Thomas is the #1 receiver in Denver.
Honestly though, it's a tough decision, and I think you'll be fine with either one. Good luck!