Its all about preference. I prefer cedars for some of my bows, and aluminums for others. Alum's are easier to tune than carbons IMO. You have more choices of spine. Also, I require at least 10gr/lb draw, and thats hard to get with most carbons. It can be hard to get with aluminums. And wieght tubes are expensive.

If I go the carbon route with my recurves this year, I am going to try gold tip trad arrows and use thier wieght system to get at least 550gr-600gr.