i first asked rusty this but decided to make it a pick to see everyones thought anyway i think kimimaro because atleast we know that it is harder than steel where as it was never said how hard gurens crystal is i don't think and the crystal was destroyed very easily by sanbi

crystal is almost as hard are crystal i am pretty sure and there is only one more thing in the WORLD that is stronger than diamond and they just found in a few years ago. There is no way the bone would break easily

Well Sanbi is a tailed monster after all it can destroy EVERYTHING easily but anyway I chose Kimimaro because I never seen Guren in battle I dont even know her plus I think Kimimaro is cool hehe

guren is my 4th favorite female character she was very cool =]

guren is cool unlike her team mates who just sucked!

i think Gurens Crystal is stronger!!!!

kakshi broke it with lighting blade so im guessing that kimimaro is better