Hydros is so easy. It is all app based and very intuitive. All of the adjustments are dome theough drop downs or click and open windows and there is absolutley no coding. I don't know anything about Apex but from what I hear there is quite the learning curve. The people who have used Apex a lot really seem to like it though.
My personal experience with Hydros was one of plug it in download the app, set up the wifi, calibrate the PH probe and start monitoring and controlling all within 20 minutes no problem. All without ever having touched an aquarium controller ever in the past. Also Hydros has the new Maven coming out for water testing....whaaat!? I am super stoked about that thing.