I'm pretty new at this as well and wondering the same things. I have bamboo straights, plastic circular, and metal circular. I really don't like the plastic ones for some reason. The metal ones were fine for working for the most part, but they do seem to hurt my hands after awhile and they are cold. I really like the bamboo, they are light and easy to work with. Regarding straight or circs, I do like the circs, but the cord can be annoying if the project is small. That's all I know so far.