The difference between ball linear guide and roller linear guide

What are the differences between ball linear guides and roller linear guides? The most direct is the medium they roll, the ball linear guide uses a rigid ball, and the roller linear guide uses a steel column.

The main difference between the ball linear guide and the roller linear guide is the bearing capacity. The roller linear guide is used in the slider with a cylindrical roller bearing, which has a large total contact area and can bear a large load, while the ball linear guide is used in the slider with a spherical roller bearing, which can bear the The load is relatively small. The advantage is that because the total contact area is small, its frictional resistance is correspondingly smaller.