IMHO, alums will be easier to work with than carbons, but carbons are SO much better.
Your mileage may vary, Jonathon, but I've found that it's no easy chore to figure out what carbons will work for your bow(s) and you. The only carbon shafting I know of that seems to work well for most shooters and bows 40-70# are the AD Trads, and there's basically only one size shaft to choose.
My bows are 40# thru 55# @ 29" draw, and I pretty much use those "cheap" Beman ICS Venture/Bowhunter carbons, always the weakest .500 spine. For me, weaker spined arras work best, but I also strive for high FOC as I feel that's very important for arra flight and tunability.
No matter what
ANYONE sez, yer gonna hafta do some amount of testing to see what brand/model/spine carbon will work best for ya. If ya can borrow some shafts for testing from buds or at the local range, that's sure the way to go.
IMO, bare shafting can help and I do that only to quickly get a feel for how a shaft reacts to a particular bow weight. After that, the real tuning begins.
I've often thought it might be a good idea to have a
Trad Gang Arrow Testing Quiver, where folks would donate bare shafts so that a decent range of unfletched arras could be passed around for testing for just the cost of postage. Hmmm ......
Best of luck!