3x 27" monitors provides lots of space for multiple usable windows it helps to also be able to switch workspaces per monitor so you switch monitors with a hotkey rather than switching windows.

Compared to peek and switch it provides more usable space since windows can be maximized without leaving space for another window to peek out, less manual arrangement since Windows need not be carefully arranged. Also I normally switch because I want to do another task or in resource to a notification.

That said however we choose to analyze it it's in part subjective matter of taste. There is no singular correct answer.