EQ (boldenone undecylenate ) has a half life of 14 days, and Primobolan Enanthate has a half life of 7-10 days, so EQ has a similar release time to deca. EQ increases red blood cell production and increases vascularity, it seems to improve cardio vascular fitness in some, where deca has the opposite effect, the increased red blood cell production possibly makes it feel like it “kicks in” quicker, however with a longer half life it will take longer to reach peak levels in your blood, and also longer to leave your system after you stop injecting, like deca.
Bear in mind both of these compounds will give you slightly different results, however you should keep most of your gains after a cycle, provided you keep training hard and eating right after you finish your cycle. Just my experience from these compounds.