That's a real difficult one, I loved my RX setup, but my wife did not like the aesthetics of the RX1s wall mounted. I liked the mid range of the RX system, RX1, RXC & RXFX, and the rears created an excellent rear sound stage and that's what I miss the most. They seemed warmer and a little softer if that makes sense.
I certainly think the Apex are much more detailed and precise, especially on movie sound tracks. The RX range where more musical, but not by much. The aesthetics are certainly better on the Apex. I also believe the Apex reveal a little bit more, I'm sure I hear things in sound tracks of films I know well, that I have not heard before.
It's a really close call, but as I don't listen to a lot of music, for me the Apex edge it, but remember I only had the RX1s upfront not the 2s or 6s so that may have made a difference.
Hope this helps.