Use an AI only if you need it ie show negative sides from high estrogen. HCG does have Estrogen spiking effects but that likely isn't too bad for most men. In other words, find out what works FOR YOU and do that. Trial and error, with guidelines to start with.
Think about the purpose HCG is supposed to serve on cycle: to emulate LH and keep some part (the boys) of the HPTA functioning to aid recovery. Then ask yourself: is this a good thing or a bad thing?
With all that said, go read this. It has the best, commonly accepted, info on the topic.
https://forums.steroid.com/anabolic-...rst-cycle.html