The AC3 is the only controller I've owned so I have no way to compare to any other brand. I'm totally happy with it. There's so many different ways to buy the unit as far as accessories.
When I got mine I purchased the controller plus, Ph probe,
orp probe, and Direct connect 8. It comes with temp probe. I also purchased the software Aqua Notes.
You can do some much as far as programming. It pretty much takes care of everything and I've got mine set to text message my cell phone if something goes a muck. I can then just use any computer that's handy and access thru a webpage and change program or turn things on or off.
You won't be sorry with this controller. Pretty pricey but worth it.