I personally use the Apex Jr. It is relatively cheap at $200 and includes 4 outlets and the very reliable temperature probe. My AI Prime, Aquamai Wavemakers and SMART ATO use their own controllers, so I don't need one controller do everything. For me, it controls the return pump, heater and chiller and skimmer. I have a webcam connected to it, so I can see my tank on my cell phone. I also got it setup to use Alexa.
Personally, my pH doesn't vary much other than a water change and there really isn't much I can do if it goes from 8.3 --> 8.5. I have a digital hand-held probe for that along with the salinity so really those 4 outlets are just fine for me.
As others have said, it is pretty much the status quo for controllers so there is lots of information for programming stuff.
It was a $200 well spent in my opinion.