It depends on what you use networks for. HTTPS is for web browsers and https websites. VPN is o/s level. A vpn will encrypt all traffic, including email, files, whiteboards, web meetings, ftp / tftp, RS-232, and many proprietary communication protocols such as used by scada systems. Of the 12-16 hours per day that my work computer is online, maybe 30 minutes is web browsing. You can also open a vpn through a https website, assuming that you have access to do so. Its a bit slow though.