Accuracy of List Source vs PropStream

[Austin Works]

I have been working with sellers on Fiverr who use PropStream and others who use ListSource  and I am finding wildly different lead counts from each seller for the same criteria. I have now entered this criteria myself into ListSource and I got a significantly lower lead count than any of these sellers. What is the cause of this inconsistency? Where have you found the most accurate lead sources? Without going to the court house.