Depends what you're intending to use the VPN for. If it's illegal activities, then you need one that doesn't log and allows payment in bitcoin. PIA/Nord both have these functions. PIA has proven in court twice that they dont log.
Personally I use Nord, as it's based in Panama it has no data retention laws, no US extradition treaty and various other advantages. If you're just going to be using it to get torrents or DNS from another continent, then just get anyone, or even use a free one.
torrentfreak does articles every year on VPN comparison.