I think it’s a bit more complicated than that. Purple Air might be calibrating the sensors they use. They are also using two sensors in their devices, so some proprietary algorithms balancing readings are probably at play here. The point is that the good perfomance of their devices cannot be simply attributed to the sensors they use. Actually there is a list from EPA, I think, that ranks other devices using the same sensor much lower than Purple Air.
So I would suggest, if availability or cost is not an issue, that you pick a sensor based on what others around you are using. In the USA they seem to favor pms-5003, while in Europe SDS011 is much more popular.
Edit: OK here is the list I am talking about:
It is US AQMD not EPA.