I shot aluminums for years then switched to carbons just to see for myself. I may shoot aluminums again but right now carbons offer a large advantage for me. Money-wise......I can shoot carbons longer because they don' t bend or break so easily, so I am actually saving money

. As far as weight, many manufacturers now make carbons available heavier.
Whatever works for each individual is fine, just put the shot in the boiler, thats the main thing.