Support from hydros is massively superior vs neptune, and that's why I'm going to switch.
I have zero experience with Hydros. But as a relative newly, who has been using a Neptune EL on a 75g planted tank, and now also have a Neptune A3 Apex Pro running on a small newbie reef, the support I have received from Neptune is terrific. They will stay on the phone with me, listen to what I want to have done, then either program the code for me, or walk me through it. I've even had them follow up with me, later, telling me they saw something on my system where there was a bit of an issue with how I had programmed an outlet. (I don't remember the specifics, but THEY reached out to me. I LOVE that.)
Do I wish a few things could be tweaked with the Apex? Sure. And I tell them. But their customer service is fantastic.
One more thing. I live on the East Coast, and there are a lot of reef aquarium stores out here. Most that I have been to use Neptune Apex equipment and/or sells the components. Maybe I missed it, but I haven't seen "Hydros" in the stores I've been in, except for maybe one or two, and I've been in a lot. I used to buy high end audio equipment, and the "Great Recession" (or even before) wiped out a lot of those companies, like Wadia, Enlightened Audio Designs, etc., so I had to scrounge to find somebody to repair two of my pieces when they needed repairs years later. One was in Virginia, and the other on a farm in central Iowa. So if I am buying into a system of products, I buy now try to only buy from companies that seem to have an established
market and customer base, because they are more likely to come out the other side of a recession, and I won't be left having to scrounge around for repair shops or eBay for replacement parts. Being under the Aperture Pet & Life umbrella probably gives Neptune a greater financial footing, as well as likely tighter integration with a number of equipment manufacturers under the same umbrella.
Just my two cents.