I’ve been riding a few workouts indoors with both. Over 90 minutes today my NP was 186W (H3) vs 193W(Vector). Bearing in mind margins of error and drive train losses between pedals and hub I reckon that’s not too bad.
I reckon a cooling fan and a bit more indoor riding will see my FTP get closer to my outdoor.
The vectors do react a lot quicker so any time I glanced at both the Garmin was higher than TR.
Thanks for the idea. If I can pluck up the energy I’ll play comparing in more detail but the NP is good enough to confirm its not miles out.