Which Groupset?

Top ten reasons to choose SRAM

1. Anti-Shimano hipsterism
   
2. Revulsion at both the exposed gear cables of earlier Shimano and the stupid little thumb levers of Campag
   
3. Brand inertia coming from MTB, where SRAM have a sizeable share of the OEM market
   
4. Weight weenie-ism, as first generation Red was the first modern OTP groupset under 2kg
   
5. Simple admiration for what a clever system DoubleTap is
   
6. Misguided patriotism by thick 'merkins.
   
7. Er...
   
8. That's it.
   
   

Almost spot on though I would say of #2, at least Shimano had earlier systems.