As a user of command line Unix, and desktop computers since before mice were common, I use arrow keys and page up/page down. When mice became common, I used scroll bar more often. For speed, keystrokes almost always beat mouse movements.
Surprisingly, only in the last few years did I really give the mouse wheel a try, due to a piece of software I was forced to use on a Chromebook. Now I use it frequently.
Track pad or the little "pencil eraser" control on some laptops (in the middle of the keyboard) are my least used methods.
On a laptop, i usually scroll while reading and use either the trackpad or a mouse scroll wheel to scroll. On the phone i tend to read the page and scroll as needed.
It depends on the content and the page. I do like using space bar rather than the page down key.
when I have a maus - scrollwheel
when I'm dealing with loadshedding and have to use my laptop by itself, two fingers, trackpad, moving in the direction of scrolling, like a regular person, none of the upside-down "grabbing the paper" rubbish that iKids like
Index finger sweeping up the screen
Racing wheel/DDR pad
I use PageDown/Space + a bookmarklet that marks where the bottom of the page was after scrolling: [Scroll Better with the Space-Bar]. (I modified mine to darken the entire old area instead of just a red line.)
[Scroll Better with the Space-Bar]: https://www.ph-uhl.com/0010-Bookmarklets/#:~:text=Scroll%20B...