Why stop at 2 power meters? I’ve recorded Favero pedals against 4iii crank against my wahoo kickr. Used a garmin headcount, garmin watch and zwift on iPad to capture data. I used DCRainmaker analysis tool to verify that all of three sources are incredibly close and there is no real trend to which one will be slightly higher or lower on any given day. Interestingly the Kickr tends to over read (higher watts) when cold. I’ll always run at least two devices for any power tests. When I meet God at the end, power files in hand, I don’t want find out my ftp was actually 299 instead of 300 and realize I lived a lie my whole life.
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