I like Omnigrid rulers the best. I like the clear narrow lines on them. I have quite a few sizes but I'll list the ones I use the most: 3 inch X 18 inch, 6 inch square, 15 inch square.
I also like the look of the new cutting system where the rotary cutter rides in a rail along the ruler's edge. I haven't tried them but if I didn't have so much invested in Omnigrids, they would be my next choice.
I don't think it's possible for one ruler to do it all. If it was possible, I don't think I'd buy it because I have enough toys.