Our service supports both HTTP and SOCKS5, but does not support the outdated SOCKS4.
HTTP(s) proxy works with the standard web content transfer protocol. In this type of proxy caching is available, which speeds up the loading of pages through the use of stored files, and also control and filtering of network traffic, setting speed limits, blocking unwanted resources, collecting statistics by saving logs, etc.
SOCKS5 is more low-level, so it works with both TCP and UDP connections. Such proxies support the following network protocols: HTTP, HTTPS, FTP and their features: caching, SSL connection, authentication. This broadens the scope of use and makes SOCKS5 a more functional option.
If your software supports both protocols, it's preferable to use SOCKS5.