As this has turned primarily into a comparison of GHL and Apex (at least for the moment), this is my analysis of differences so far:
Apex
Pros over Profilux: More toys/accessories, more controllable outlets on powerbar, software is easily PC and Mac compatible (since it is FULLY functional from cloud for setup, programming, and firmware updates, there's no issue with platform compatibility), has acquired equipment for alk monitoring from Jim Welsh that will be coming to market soon (hopefully)
Cons: Reportedly a less stable system than GHL (though I wouldn't at all call it unstable), having to buy a module for every accessory (though from my understanding GHL does require expansion cards for the same function...so Apex needs more wires, but expansion options cost money with either system)
GHL
Pros over Apex: More stable system, cleaner setup (fewer wires), Calcium AND alk monitoring reported as coming soon (though I'm not sure if this means they have a working model or not? "Coming soon" might mean 2-3 years for all we know at this point...so for users TODAY, this isn't really a strong "pro" since it's only a promise at this point and not yet a reality)
Cons: I'm still not a fan of the 5.1 powerbar (not a deal breaker, but GHL only has 5 controllable outlets on their powerbar as compared to Apex's 8 controllable outlets), Not macOS compatible (I understand there are ways around this, but it's still a detractor as a Mac user...particularly when comparing it to Fusion).
So back to comparing powerbars to eb8's for a minute (because this is a point of comparison that is important IMHO). Has anyone ever complained about having the additional outlets on an eb8 (like perhaps they overloaded the eb8)? I'm still trying to make sense of the argument that 5 is better than 8...it still seems to me that having more controllable outlets is a preferred option. For items that require constant power, might it not just make sense to have a standalone surge suppressor?
Btw, I do really like both systems and plan to have them set up on separate tanks at some point so I can get to know them both. I don't think a consumer that chooses EITHER of them is making a "bad" choice.