Who do I start? Greg Olsen TE or Heath Miller TE?

Greg Olsen has been targeted more by Jay Cutler and had himself a break-out game against Arizona. Ans has been progressively putting up more points. The Bears will be playing the 49-ers...tonight. Heath Miller has been pretty much solid but had a down week last week, Ben spread the ball around and didn't send it Heath's way. Steelers are playing the Bengals this week. Who should I start?