The preferences will be different. It depends on how your body reacts to them or accepts them. For me its EQ over Mast because Mast makes my hair fall out and my prostate gives me problems. With EQ the only sides I get is high blood cell count and increased hunger so EQ for me.
Also a lot of people say EQ takes a while to kick in not for me. In a week or two I see my traps and shoulders swell up and my strength increases. That’s another reason I like EQ. It was a popular compound not to long ago. Jay Cutler recently said EQ was always in his cycles.
I would say Primo is the best but right now the price and the availability to find it is harder than it was years past, but I love Primo the best!