There are a lot of factors to consider when choosing a VPN service. For some, speed is important, for others, safety.

Pros:
Your personal traffic is encrypted and transmitted securely over the Internet. This will protect you from a variety of Internet threats.
If you use a VPN service, then it becomes extremely difficult for hackers to gain access to your data and correspondence.
You can use public WiFi hotspots without worrying about hackers, and you can securely connect to any remote servers.
A high level of protection will bring you closer to being able to surf the net truly anonymously.

Minuses:
Depending on the type of VPN service, the security protocol can be difficult to set up, and errors during the setup process can lead to security vulnerabilities.
If the VPN service is not configured correctly, DNS and IP address leaks can occur, which can be used for criminal purposes by hackers.
There are many security protocols available today and you may not know for sure which one is the best. However, you can read more about this topic here.
Security is by far the most important aspect of VPN services. The trick is to know which security protocols each service will give you access to and how to configure them.