I believe there is no set answer to your question. If possible, you need to hear these amps in your system to make a good decision.
I have owned a Leben CS600, Atma-Sphere M-60 MK 3.1, and Audio Note Conquest Silver amps. I have not used all of them on the same speakers, but I have used the Atma-Sphere M-60 and AN Conquest Silver on the same Audio Note AN-e/SPe HE loudspeakers, and in my room with my associated gear the Audio Note amps were preferable to me. For some reason, the Atma-Sphere amps produced too much bass energy and quickly became fatiguing (this even if running them with half the complement of power tubes). The Audio Note amps produce a well balanced sound with a nice three dimensional image. The Atma-Sphere amps produced a much flatter (buy wider) image.
The Leben CS600 was magical with Castle Acoustics Howard II loudspeakers. It was not so great with Silverline Sonata III loudspeakers.
The Atma-Sphere amps will most certainly match well. Whether the resulting sound is what you're after only you can decide.
If you decide to try an Audio Note amp, buy one used or with a heavy discount. Audio Note electronics lose their value precipitously.