Like others have said go ride SRAM first to see if you'd like it. Next question is do you have an existing wheelset that you want to use that's not 11spd compatible? If not, then I'd make my decision between SRAM and 11spd Shimano - and that's a personal preference thing. I have SRAM Red on my road bike and recently got a cross bike with Ultegra (my first bike with a higher end Shimano) and like both equally. I actually like the Ultegra better than I expected so when it comes time to replace groupset on my road bike it's going to be a tough decision. Good luck!