What Power Meter Have tu Use

Hello

Recently I bought a smart trainer the cycleops magnus.

Currently I also have my garmin vector 2s pedals.

What do you recommend to measure the power in zwift? the Magnus or the Garmin Pedals?

I calibrated my magnus in Cycle Virtual Training and the power shown by Zwift versus Garmin Vector is almost double. Or is it better to calibrate it with zwift?

Recently I calibrated my Magnus in zwift but the lectures also difered with the garmin.

Best Greeting from Guatemala

use the vector2 pedals as your power source…  are they calibrated correctly (ie right crank length)