I've used all of the usual ones, as well as seyes (LOADS! French school system grad here), dots, and music (after a fashion; just during music lessons as a kid). Over time, my favorites have evolved from Seyes to lines (first with the border demarcation to the left like on seyes, then plain lines) to blank. Mostly it was because as I became more and more confident about positioning on the page, I needed correspondingly fewer guides for regular everyday use. And of course, being able to write on blank paper really means a veritable explosion in the range of papers you can use, because there are more types available blank than any other type! And when you go through a thousand sheets a term, that stuff counts lol.
The only one I could never abide was graph, specifically quadrille. First, because graph is usually printed the same way all the way to the edges - no borders at all, so when I still needed more printed guidance, it provided none. Second, because the spacing sucked for my size of handwriting - writing on every horizontal line was too cramped, writing on every other line led to too much spacing and looked awkward. Third, it always looked really busy to my eye, and that's saying something as seyes isn't exactly uncluttered!
I've also never liked lines that were too bold, even when I had to have them. I think the end result looks much prettier when they disappear beneath the text!
Edited by Plume145, 10 May 2012 - 01:30.