Both are world class. Your decision should be based on audition and personal preference. IMHO … recognizing that my comparisons were not with standardized electronics and the performance of speakers at this level are extremely sensitive to electronics and environment, …
I found the S7 more coherent because the bass impact matched the mids and highs better. This is not to say the Maestro is deficient. The S7 was brutally honest with recordings. The Maestro always told the truth but was more forgiving. The test selections were controlled.
I purchased at a level below you because my room is smaller. I compared Focal, Magico, Raidho, Wilson, and Vivid. I chose the Vivid Giya G3. IMHO as coherent, as clear and detailed, but also musical to my preference. If you will allow, subjectively a little more warm and sweet on top. Also a little easier to drive for your two choices need much power. I do not have as much power as you with my integrated. If you can get past the not traditional aesthetic, you should add them to your research and audition list. At your price point the model would be the Giya G2 S2. If you go higher, the G1 Spirit.
You cannot go wrong with any choice. It comes down to personal preference, system compatibility, and environment (setup). Good luck
