I've only used Private Internet Access, Air VPN and Hotspot shield.
But i'd recommend Airvpn.
The problem I had with the other two VPN's I tried was the lack of decent port forwarding. PIA has port forwarding for some of their servers but you can only forward one port. I haven't been able to play games like hearthstone while having the VPN enabled because it needs multiple ports forwarded and I haven't been able to torrent while using a nearby PIA server since the closest server that can port forward is France. Hotspot shield blocks torrents and can be slow so I don't recommend it.
But i'd recommend Airvpn.
The problem I had with the other two VPN's I tried was the lack of decent port forwarding. PIA has port forwarding for some of their servers but you can only forward one port. I haven't been able to play games like hearthstone while having the VPN enabled because it needs multiple ports forwarded and I haven't been able to torrent while using a nearby PIA server since the closest server that can port forward is France. Hotspot shield blocks torrents and can be slow so I don't recommend it.