AI's hinder testosterone's ability to convert to estrogen via the aromatase enzyme. SERMs prevent estrogen binding to the estrogen receptor in certain tissues. There are many other differences between them. Research and ye shall find.
HCG lasts only 4-6 weeks after reconstruction, which is fine if you just want to use it at the end of the cycle/during PCT.
You should really get a few vials of 2000IU or 5000IU ones and inject 500IU e4d - e5d
Never used EQ myself but always been told that it should be run for 16 preferably 18 weeks. My buddy run it with along with test for 10wks, didnt notice any difference compared to his test solo cycles he has done in the past.
I'm 5 weeks into a EQ cycle and haven't noticed anything yet. MAYBE a little more vascularity and I seem to process my food better. Like when I eat, I'm not stuffed and bloated for as long. I have the ability to eat more because of that. I haven't experienced the increased appeitite yet. I'm running it at 600mg/wk.