Aluminium is what I go for personally. My bike has aluminium frame with carbon forks. This provides a bit of dampening during the ride but frame is more rigid and not much heavier. Whole bike is like 8.7kg anyway. Also any benefit you gain from getting carbon bike is easily negated by the gear you have to carry with you since you don’t have a support team.
Aluminium is what I go for personally. My bike has aluminium frame with carbon forks. This provides a bit of dampening during the ride but frame is more rigid and not much heavier. Whole bike is like 8.7kg anyway. Also any benefit you gain from getting carbon bike is easily negated by the gear you have to carry with you since you don’t have a support team.