been using Shimano XTR and SRAM x.9 on my bikes now for two years.
I prefer the XTR over the X.9.

also I prefer the Dual Control shifters over triggers but like Gripshifts so the X.9 is gripshift.

Under riding conditions:

The XTR dual control does not shift if you hit bumps if don't rest your weight on the levers. I can brake and down shift or upshift at teh same time while keeping my thumb wrapped around the bars for max control. Trigger shifter don;t allow this because you thumb is resting on a lever.

I'll keep my SRAM bike gripshift but the Dual control is where the ergonomics is at at this moment.

top kit that can;t be faulted, except by free ridy types who feel the need to continually break things to increase their cool factor