Or do you think I should be using the Liuyedao not the Niuwedao?
Depends on your build, whether the weapon is loomed, etc. With 6 PS, anything below 33 cut starts to have serious glance issues on people in loomed medium-heavy armor. If it's Masterwork and/or you have 7+PS, the extra speed and thinner model on the liuyedao is probably better.
With 1h, I think the best philosophy is to get enough damage/PS that you don't glance often, then get as much speed as you can. Everyone is so good at blocking now, you aren't going to land many hits without a lot of speed and good use of holds/feints/kicks/etc.