Bathroom as an example:

I have both of those sliding styles in my house. Kitchen windows are all side sliding, and are as wide as all other vertical sliding windows in the house are tall.

Except the bathroom, that one is half as tall as the tall ones/half as wide as the wide ones, it slides vertically.

All vertical sliding windows have the opening at the bottom, all horizontal sliding windows have the opening on the right.

West coast, USA.

I also have windows that slide left/right. Specifically, the right side slides left to open, right to close. Two are "landscape," one is "portrait" shaped. Then I have three sliding-glass doors, which work exactly the same way except for the latch, threshold, and the fact that the screen also slides. It may be relevant that it never snows here.