Depends on what you actually need it for.
If your downloading torrents then you need one with good p2p support and optimization.
If you do important business and need to ensure all your traffic is encrypted and not logged, then you need to do ALOT of research, as many vpn providers say they don't keep logs, but they do.
If you just want to spoof your location or hide your searches from your isp, then you can use any.
If you're doing illegal stuff, or anything that the government may want to track, then use Tor instead.
If you just want privacy, then don't bother, using a vpn does barely anything to protect your privacy, you can still be identified and tracked using unique device identifiers, cookies, many ways, and most people don't know how to protect against it, meaning that using a vpn is like walking into a hail of bullets with metal shoes, and thinking your protected, you are, but not in a way that counts, and it just creates a false sense of security.
Until you can decide what you need from a vpn, you can't make an informed choice. There are many different features that make some better than others, such as kill switches, auto connecting, p2p support, virtual servers, which protocols they use, what speeds u can expect or need....the list goes on. You need to learn about this before you can get advice on which one is best.
My recommendation, don't bother, anyone who needs to think about if they need it, doesn't need it. The only legal mainstream use for a vpn is location spoofing to access streaming content not available in your country, on platforms like Netflix.
