Not saying it won't work well, only that there may be reasons to choose one over the other. Your first hand experience being one of those reasons...
I've found the firmware versions on these can greatly effect the audio quality. I recently reverted my 2018 UAQ from 39.6 to 39.5 to remedy this. Immediately noticeable is the range of the volume knob. I typically listen to music at 24, on the 39.6 firmware I could go all the way to 40 and not be satisfied with the level. It also was difficult to hear all of the instruments until volume levels 30+ on 39.6.
All this to say a firmware upgrade might be in order but can result in bricks so flash at your own risk and try to find the most suitable version first.
Also, I don't have the Kicker Key so it might make all of what I just said needless. It is the last upgrade I plan to do audio wise (eventually)...