The Brembo's are the heaviest among the 3 mentioned. I'd guess the Braketech to be the lightest based solely on holding them in hand versus feel of a Galfer wave, but it's relatively close. What is not close, ime, is the brake performance and feel of the Braketech Ductile iron rotor. There is nothing that allows feel and modulation like those rotors. Take care
Wrt weight, today I replaced my steel swiss chees rotors with a brand new pair of Brembo full floaters cast iron rotors. Before firment I weighed them both - the swiss cheese ones weighed in at 1.880kg each and the Brembo full floaters weighed in at 1.7kg. Thats a difference of 180g per rotor and 360g for the pair.