Assuming we know the difference between static and dynamic IPs, a static IP address would be helpful if the user is in need of a reliable naming resolution, using services like Voice over Internet Protocol (VoIP), online gaming servers (where a static IP address may be imperative), hosting one’s own web, mail, FTP, or DNS server and to maintain privacy of one’s IP address from prying eyes and internet threats. A static IP address, however, is highly vulnerable to security risk, since the address is always the same, and is not a cost-effective choice, since the cost of setting up is comparatively higher than that of a dynamic IP address.
A dynamic IP address, on the other hand, is less vulnerable to threats, as the IP address keeps changing, can be used to perform very basic needs, such as browsing the internet, sending and receiving mail, downloading and uploading files, forums, instant messaging, etc, and is cost-effective, and users can even host their own websites and mail servers with the help of DDNS capabilities. But, it is less reliable and cannot be used for VoIP or playing online games.
These two different methods are simply an approach of giving an identifier to the device and it will not affect the speed or quality of service between them. The major providers of static IP address are PureVPN, StrongVPN, IAPS VPN, VPN Secure and many more, and the major providers of dynamic IP address are HideMyAss, Private Internet Access, StrongVPN, ibVPN and many more. Ultimately, the decision of choosing an IP address would rest with the end user.