I agree with the fact that you need to test them out because only you can actually test these services for your purposes. Apart from that, both services are pretty reputable and visiting their websites suggests that they are pretty good with their VPN services. Only noticed 2 things (1) PIA VPN is cheaper than PureVPN (2) PureVPN has some extra features featurres like Anti Virus, content and web filtering, and App Blocker, which I didn't find on PIA. But the suggestion still is that if you can try/test both out, would be really great, or at least get the reviews on the basis of your needs and the servers which you would be connecting to!