Is it a ball screw or a straight guide?
Different things, not comparable, like, are used in combination of the 2
No comparison, usually 2 combinations used ~!
The ball screw is better than the linear guide. Because the ball screw has high precision and long service life. The price is high. But the linear guide rail will wear badly in the frequently used position after a period of use, and it can not be well maintained. But its price is low.
See what you use on the occasion, such as ball screw and linear guide combination, in the linear module, the use of the implementation of two different functions, indispensable, according to no comparability. Look at the picture below... The linear module manufacturer answers for you.