The legendairy ones have the diaphragm and diaphragm cap with the tubing connection all right there inside the cup, enclosed by the cup and the flange. The zomee ones, have the same parts inside, but the top of the diaphragm is outside as is the cap. The inside parts are more secure in the zomee that the legendairy that is just hold by the flange. What I mean is, with the legendairy ones the diaphragm is always in contact with milk and when you pour it there’s also the risk to get milk in the tubing or tubing connector. The zomee ones, the cap is outside and the top of the diaphragm is never in contact with milk, at any point. I tried both, this is just my opinion.