I know it's been touched upon in the past, but I think my question is a little different. How much difference do you think an aero crank with aero chainrings like the Rotor 3D+ has over a crank like the SRAM Red. I'm thinking of switching from the Rotor 3D+ with a TT chainring to the Quarq/SRAM Red crankset (I currently use a Powertap) and am weighing the pros and the cons. I'm currently set-up with 2013 red/yaw drivetrain (minus the crank). The pros and cons as I see it are as follows:

Pros:
1 - Crank based power meter
2 - Possible improvement in the quality of shifting
3 - Lighter (and by a couple hundred grams)
4 - Cheaper than the Rotor PM
5 - I trust Quarq and SRAM (don't know enough about Rotor power yet)

Cons:
1- Less Aero... but how much so?
2- Possibly less stiffness/power transfer
3 - Rotor PM has a few extra features like independant left/right power, pedal efficiency, etc...

I really prefer a crank based power meter over my PT and would consider looking into the Rotor Power Meter when it comes around (or some of the other options), but I think the Quarq Red might be the cheaper and best option.

Does anyone have any thoughts, data or experience on such a change?