[GeoAtreides]

I have running for years both SCD30 and SCD41, and they're very much in-sync, although the technology is different. SCD41 is very sensitive to voltage, so you need to keep it as stable as possible. SCD30 is NDIR, so it doesn't need calibration (mostly...).

For VOC also run SEN55, BME680 with BSEC 2.0 and BME688 with BSEC 2.6, they mostly agree, with the SEN55 being more sensitive to 'chemicals' (think industrial chemicals vs living entities chemicals), and BME688 more 'agressive/sensitive' to changes than BME680.