There is no comparison
Wife has a D9 - owned for a couple of years - transmitter never worked properly, picked up someone elses tranmitter on a rib a few weeks ago, resets evry time you turn it on, lost link in stoney cove at 30m, poor display, especially in low light, complex screen, little buttons (now how are you gonna do that with 5mm gloves...It is a fancy watch for talking about diving in the pub.
Have owned Uwatec AirZNitrox for 5 years - tranmitter is bullet proof - wife has just bought a Galileo sol - simple large screen, easy to read, same great AI transmitter system, upgradable software on line, screen can be set to simple display that changes to show more info when required, easy to read and you can change your own battery! Superb bit of kit.
Me, I like the sol, but will stick with my Airz for hols and VR3 for rest