The carbon blades are typically a bit more durable than the woodies (as far as dents and dings goes anyways, they'll still shatter in a decent crash) but if you're new to heli's I would say stick with the woodies for a while as they're cheaper to replace.

Best bet on the replacement parts is to buy one of everything because if you have the luck I have you will break the one part you don't have when you crash