Buffered VPN and Private Tunnel have a number of commonalities which set them apart from Private Internet Access (PIA). Neither has a built-in kill switch and they share a similar number of servers and server countries. PIA does include a kill switch and brings a significantly higher number of servers, stretching well into the thousands, rather than just a few hundred. All three are easy to install and use, however it’s worth noting that Buffered VPN does not have a native mobile app.
Additionally, whilst it can still be used on a range of devices, it can be tricky to setup for the less tech-savvy. PIA is very competitively priced and generally comes in cheaper than both Buffered VPN and Private Tunnel, however the latter allows you to buy certain quantities of data which can be used at any time, rather than a fixed monthly, bi-annual, or annual plan.