Why UDP isn't good for real-time applications:

  * lack of a connection
  * lack of order
  * lack of retransmission
  * lack of error checking
  * lack of flow and congestion control
  * lack of integrity/security

Why TCP isn't good for real-time applications:

  * latency
  * latency
  * latency
  * latency
  * latency
  * latency

SCTP's only advantages over TCP for real-time applications is unordered data delivery and selective acknowledgement. In this way we can still use the most recently arrived message instead of the correct ordered one, which will reduce latency in one area.

But the 'association' is still be affected by congestion control, especially with multiple failures in the same window. Using Reno SCTP, this may be mitigated, and it is argued that some congestion control is much better than none at all. But without evidence specific to an application's implementation, UDP is still the superior real-time protocol if you don't care about what data you're getting.