TCP

• The key goal of TCP is trustworthy process of transmission. 

• TCP works on something called 'flow control principle' which means it won't transmit new data if previous packages haven't been fully transmitted.

• Thus, the pro of TCP protocol is that it's guaranteed all data packages will be delivered, and no part of the media stream will be lost.

• However, because of this TCP for video stream can be time-consuming and have more delays than UDP.  

UDP

• UDP doesn't spend effort fixing delivery efforts, and prioritizes uninterrupted flow of information.  

• Thus, one source notes that UDP is more desirable for streaming video.  

•  Another source notes that the use case is likely relevant. Streaming sports would be better for UDP as even a few second lag may make people miss a major game event, whereas for streaming where the quality including having no gaps is of higher priority, for example, streaming or downloading a video for quality playback, TCP may be better.