i would say they would both take about the same sort of time frame to work but you would notice slightly more with the eq. and besides real primo is so difficult to get hold of, most sources are carrying fakes without even knowing it.
EQ will put on more pounds BUT will act slower (3 weeks)
Can't win here bro...LOL....LOL....
Some other notes:
If you are prone to M,avoid Primo! Other than that, little to NO sides will occur with Primo.
If you are looking tio stay extra lean while doing EQ, use an anti-E as EQ mildly converts to estrogen which will obviously translate to water weight/gain (bye-bye "ripped look")
Primo will get you silly-ripped but IMHO you will not gain much mass! It's a cuttting drug!