I've just started to use the Olfa Frosted rulers and I really like them.
The lines are nice and thin and it doesn't feel 'cluttered'
The Quilter's Rule line has thick lines/grids/grippers - and I don't use them anymore. They also seemed to 'shave down' faster than some of my other ones.
I have quite a few Omni-Grid ones, but I'm starting to prefer the frosted ones.
My favorite ruler for tiny pieces is the 4x8 Omnigrid with the 1/8 inch grid.
I also prefer the 1/8 inch grid 3 x 18 inch Omnigrid ruler to the one that's marked 'the other way' of the Omnigrid 3 x 18 inch ruler.
I will say that it's good to check ANY ruler against the other one that one is currently using.
Also, rulers WILL wear down (get shaved/eroded) after a lot of use - I've ended up with shallow curves in the center of longer rulers because the center gets a lot more use than the ends do!