Mechanically they are the same, use the same solenoid. Apart from that it's mainly what features you are looking for.
Main difference is that the AVCR has gear/RPM based boost control, a scramble mode - which the boost control kit doesn't have. However the boost control kit integrates nicely with your FC Commander so you don't need to install a separate unit.
I've tuned with nearly every boost controller on the market.... IMOP.... the Greddy line of product really does offer a solid piece in the Profec B Spec 2, we run upwards of 20-30psi in some of our applications and combine NOS as well, and it does a great job in controlling over boost.
You can also add a wireless button to your steering wheel for switching from high to low boost... and or over boost for a few seconds... the Apexi unit is a chore to set up and get confusing between maps, most people just end up using the manual settings....
Lastly the HKS EVC-EZ is the easiest to use in terms of function without frills....
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