Is carton milk tastier than bag?

My kid claims that milk from a carton tastes better than one from a bag. He was able to identity the bagged Nelson compared to Natrel from a carton. Do people agree that carton milk is tastier? Of course comparing Nelson to Natrel is not a pure experiment, but that’s what we had in the fridge. Also, how about the taste of milk from glass containers? Worth the extra hassle of consignment and refund? Note: in all cases, I’m not talking about organic, just regular milk.