I think the preference difference might have something to do with being used to scroll wheels or not. I personally grew up using mice with scroll wheels before I got my first touch screen device (iPod touch) so when trackpads started supporting multi-touch scroll I was already used to scrolling my fingers down to move down in the content.
So you write out all your commands as machine code I assume? wait no, obviously you set the transistor state manually with an electron gun?
not pictured, but uniball eye micro was my goat for high school and college. I had to do british standardized exams in high school which required black pen (not pencil). these guys write super smoothly and create really nice lines, but they take a sec or two to dry so you gotta be careful not to smudge.
I think #1 in the pic is a thicker version of these
For first person games, map reload on mouse 4 and sprint (or whatever else was on shift, maybe a spell) on mouse 5. Melee is left alt.