I believe that the Sensirion SGP41 is the slightly better VOC sensor and it also gives an NOx signal that can be useful:
"The testing results show that the SGP41 has a better response for 9/10 tested VOC solvents and can detect the level of NOx gases, which is a unique and important feature for hazardous and toxic gas detection and alarm systems."[1]
In general measuring VOCs is quite challenging and people really need to understand these type of sensors. A couple of months ago, I wrote a whole blog post about these issues. [2].