UDP
Faster Speed – suitable for UDP VPN service offers significantly higher speeds than TCP.
Less Reliable – UDP includes error checking (but with no recovery), where delivery of packets are not guaranteed.
Best for video conferencing, gaming, broadcasts, and downloading torrents/p2p.
https://www.namecheap.com/support/knowledgebase/article.aspx/10432/2274/which-protocol-to-choose/
OR
like us without TLS/SSL
https://www.namecheap.com/support/knowledgebase/article.aspx/10432/2274/which-protocol-to-choose/