If your goal is to protect your personal data from prying eyes, you want a VPN on whatever you are using. That means having a VPN to protect your laptop, your MacBook, your phone, your Xbox and your smart TV.  If your goal is to use a VPN to gain access to streaming services which have been made unavailable in your country for whatever reason, you want a VPN on whatever device you are using to access those streaming services. This could be as simple as a VPN for your Chrome browser or setting up a VPN for your Amazon Fire TV Stick.  Whatever your reason for wanting a VPN, it's usually a good idea to have it set up and ready to go on as many of your web-connected devices as possible.