I have a mixed SRAM groupset (including Force crankset and brakes) and my bike weighs out at 14.99 lbs with cages and pedals. The weight difference isn't that big a deal. I have Red shifters. Zero loss isn't that big a deal. (SRAM shifting isn't that great, regardless. If you were into the nuances of shifting performance, you wouldn't be buying SRAM.) Go with whichever you want. Styling is a difference nobody is talking about -- but it may be as important as the other factors. Styling is why I'm riding a Force crankset -- I can't stand the stamped sheet metal look of Red chainrings.