masteron is a dht derivative as well as is superdrol being that is a dimethylated version of masteron however the dimethyl group drastically changes the behavior of the drug. masteron is known for increasing rbc count thus improving vascularity, it also has a high affinity for shbg hence y it is more effective when stacked with testosterone, as well it is a mild anti estrogen as its origional purpose was for breast cancer patients this gives users a dry look making it preferable for cutting, being that its mmore androgenc it increaes libido and it promotes a dence apperence and is not responsibl for greatly increased glycogen retention or increases in size. superdrol on the other hand is very different in that it promotes extreme glycogen supercompensation making it more effective on a bulking diet. as well as it is more anabolic it will have a negative effect on libido. so basically though structurally similar they have almost opposite uses and effects hope that helps