What weighs less....Quarq vs Rival Stages

I am currently running SRAM red 22.

Which of the two options below offers the lowest weight penalty?

Going from a SRAM Red 22 crankset to a Quarq Sram Red 22 crankset…

or

Adding a Stages Rival crankarm to my existing SRAM Red 22 crankset?

If you are spending money on a powermeter, you should probably focus on how well it measures power, not on its weight.

I agree a million times with the poster above me, but the Stages will weigh less. Of course, it’s only half a power meter though, so you’d might as well just go with the Quarq.

Even if my only race in life was a hillclimb TT I would pick the Quarq despite it being heavier.