Personally, I'd lean towards the crank - one battery, one set of electronics to worry about. Pedals are just more finicky.
In fact, I like the Quarq Dzero/DFours in my household a lot, and CC has them on a good sale if they still have the type for your bike:
https://www.competitivecyclist.com/p...d%3AQuarq&nf=1