I shoot both of them,depending on which bow I'm shootingI prefer an aluminum for my Hill(or wood),with alumninum they seem to tune and fly better for my bows cut off center.It doesn't require s much tinkering and has enough weight. usally within my 9-11 GPP goal for them.And shoot aluminum on one of my ILF bows,shoot a 2312 X7 on a 52# metal riser ILF.The spine and weight is more consistent.I do shoot a lot of carbons on my other reurves and longbows,carbons are very durable and when tuned well are great flying arrows also!