Playing videos from a quicktime file VS youtube

Hi,
I am building an app which needs to be able to play videos. My choices are:
1. Play directly from Youtube (not sure of the size of file, but is 10min long approx in SD).
2. Play a quicktime file which is approx 50MB in size from the web
Does anyone have an opinion on the performance of the two methods? Sorry if I haven't provided enough information.
Many thanks

https://developer.apple.com/library/ios/codinghowtos/AudioAndVideo/

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