I have NX, XT, and SLX 1x11 speed, all with Sunrace cassettes. Honestly, they all work fine for me, they just feel different in the shifter. Push or pull a lever, they shift. The Shimanos feel more crisp and precise at the shifter, but they don't shift any more reliably or faster than the NX. I like the ergonomics of the SRAM shifter a little better.
And none of these shift any better than literally any other rear shifting I have owned for the past 20 years. Main thing I notice is that 11 speed seems more picky about having a perfectly straight RD hangar.