My main writing paper is a steno book, Gregg ruled (all I can find at the stores, because I've looked to try to compare). I've used other, but these are inexpensive, easy to find at any store (even dollar stores), and work.
"Gregg Shorthand had achieved the most extraordinary success ever attained by any system in the history of shorthand." John Robert Gregg, 1922
If you'd like to reply, for example, if you're learning shorthand or maybe you are using a notebook of some sort.
In a 1917 book it suggested having a line down the center. Do you do that? or was that helpful in your learning? I know in writing for speed it helps because your hand won't move (much, if at all) from the center line back to the right side; then the right edge to the center line).
Wide rule filler paper in a binder, out of habit mostly. But also I like not having to turn pages too often, and I can add and remove pages at whim. Also I've started making a column (about an inch or two wide) on each page, to write "problem words" I didn't quite understand for various reasons.
I have a few steno pads though, some with a few pages written in them. When I get into dictation I think I'll use them more since they're convenient to carry around