Both Shimano and SRAM make great products, but I still like the SRAM best. The hoods are much more comfy (not as wide as Shimano), the distance of the levers from the bars is adjustable, and the distance you have to flick the levers to shift is less than with Shimano. I find the SRAM shifting from one cog/ring to the next on both front & rear to be nearly instantaneous (versus the slight delay with Shimano). At the same price point, SRAM tends to weigh less.

You can't go wrong with either. Pick the components that fit your hands best - either way, shifting will be good.