Profilux vs Apex

[Aquattro]

So far, looking at all 3 products, I've decided that they all need to dumb down their product promo material. I'm not an electrical engineer, and mostly still don't know what I need to accomplish x, y & z.
Like why do I need a module that plugs into the Apex which measures pH/ORP when the unit does that out of the box? And a bus is something people ride on, not install on their tanks :P
Use.Simple.Words.