It depends.

My personal servers are a mix of the two. I have a Synology NAS that I manage through a web-based GUI. Sometimes I’ll dip into command line via SSH, but not very often.

I have two more lower-power Linux servers that I manage through command-line primarily. They don’t have many system resources, so I want them to have as much available as possible to serve things.

Windows servers I use GUI management most of the time