Both offer encryption that stealths you to your ISP. The generic, knee-jerk reaction is to use either a VPN or Tor. The FBI and the British Government complain about bad guys going dark, but now the rest of us have to do so too, if we want any shred of privacy.
Now that Republicans in Congress have sold us out, everyone is writing about technical ways to prevent your internet service provider (ISP) from watching your on-line activity.
