For the tract level, using instrumental mag for the star - PSF size plot does not make sense, because that magnitude does not mean anything. So it would be better to use calibrated mag. On the other hand, using instrumental mag for the visit level can make sense, because it directly reflects the number of photons that fell into the pixel.
For the tract level, using instrumental mag for the star - PSF size plot does not make sense, because that magnitude does not mean anything. So it would be better to use calibrated mag. On the other hand, using instrumental mag for the visit level can make sense, because it directly reflects the number of photons that fell into the pixel.