Taskbar On Side _hot_
While modern "responsive" apps (like web browsers) handle a vertical taskbar fine by simply narrowing their width, some older or poorly designed software acts strangely. You may encounter apps that open in a window size that assumes a bottom taskbar, resulting in the bottom of the window being cut off or awkward white space on the side.
If you use an Ultrawide monitor (21:9 or 32:9), the vertical taskbar is almost essential. You have so much horizontal space that a vertical strip on the left or right is barely noticeable, whereas a bottom bar creates a claustrophobic letterbox effect. taskbar on side