it might seem like a silly thing to complain about, but I specifically chose the Helix over the Onix (When i was looking a few years ago) due to the quick release bracket for the cords vs the fine threaded connections for each cord on the back of the Onix/Solix… I remove my head unit all the time and the threaded connectors would be a pita for me everytime I used it…I also didn’t like the idea of a touchscreen as I like my screens to be as clean without smudge marks, just personal preference..
Outside of that, the Solix units are far superior to the Helix line, but also almost twice the cost. Energy draw is another thing to think about with the Solix…