The Axxess and Incline series are very closely related. So widening the Axxess or narrowing the incline will produce very similar results.
below are some (not all) basic characteristics of the different constructions.
Glass: great in most conditions, more lively feel
metal: more expensive, easy to ride, very damp, works well in all conditions, not quite as durable as fiberglass
carbon: more expensive, easy to ride, almost as damp as metal, works well in all conditions, super light weight, not as durable as metal