Inna. Linear tracking arms have some unique advantages in the tracking error area, and are generally preferred for that reason. However, all linear tracking designs are not created equal, and the ones that can best take advantage of this design are quite complex and expensive. This puts really good linear tracking out of the price range of a lot of buyers. Lower cost linear trackers introduce other problems that outweigh the potential benefits that they might try to provide with this design. So generally it is understood that in the lower to medium price ranges, the pivot arm is a better choice. And even in the high end, there are some advantages to pivot arms, but near-elimination of tracking error is not one of them.
