Comparing the two bearings, tapered ones will have a larger contact surface area between the race and rollers than angular ones. With this being said, tapered ones will require more of a clamping force to minimize backlash thus requiring more torque to rotate the bearing. Lets not forget the resistance of the grease and because of the physical size there is a larger rotational inertia. They are designed for low speed and heavy loads.
Angular contact bearings are smaller, lighter in weight, less rolling friction and will operate at a higher rotational speed. Yes they do cost more but they are worth it in the long run.
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