The answer is always Campy Record 9.0 Pro model or Super Record EPS Moviestar model, of course!
Better = very subjective at this level. Dura Ace and Force/Red are both capable of getting you through a local century or on the podium at the Tour.
Weight difference? Negligible.
Quality of groups? About even from what I have surmised with 'perhaps' shimaNO being a bit more durable under high mileage riders for some of the components. Take that as a somewhat speculative opinion based on a small sample size too.
The real question is do you prefer the mechanical SRAM setup or the electrically shifted shimaNO? But, to answer your question based on listening to my friends shift both brands of mechanical groups...shimaNO. It also wins points for the universal availability of spare parts and pricing (at least in the U.S.A.).
There is also the option of waiting for SRAM's electric group and going wireless if that hits the market sometime soon.
Canyon includes a torque wrench with the bike? That's awesome. The cost in saved warranty claims would justify subsidizing the wrench.