Arc Ultra + Apple Music - Loud or underwhelming?

I currently have the Arc and gen 3 subwoofer on my main floor in the family room and love the sound quality and loudness I get when playing music from Apple Music to this system. I use Apple Music through the Sonos app or Apple TV 4K and have had no issues!

I was looking at getting the arc ultra and gen 4 subwoofer to go in my basement setup but have seen conflicting reports on how the arc ultra sounds and is underwhelming not as loud as the arc is. Should I upgrade or save the money and get another arc and sub 3 for the basement?