Fighting in playoffs - D.Mason (Bal WR vs Houston) or Sidney Rice (Min WR vs NYG)?

Fighting hard in the playoffs after having Calvin Johnson have a very quiet day and another WR with negatives. So, for my third spot, should I go with Derrick Mason of Baltimore against Houston, or Sidney Rice of Minnesota against the Giants? Hesitant about Rice because who knows who the QB will be (granted, Rice had a superb game last week with Favre out) but I also have the Giants defense, so if Rice does well, then that hurts my defensive points a little. Help!