which consumes もっと見る internet/data? downloading または streaming?

It`s +/- same amount of data. Everything really comes down to several factors:
*are あなた going to watch the file もっと見る than once? (If yes, downloading is the best option. If no, then streaming might be もっと見る efficient)
*does quality of the file matter? (e.g. if あなた download file, it will be in the quality it is, while あなた can adjust quality and stream it in lower resolution, therefore using less data)
*do あなた have a lot of free 宇宙 for file storing? (If the 宇宙 on あなた computer/phone is huge, あなた can surely store downloaded files on there. But if あなた may run out of storage, better option would be to stream.)
If quality would be same, storage doesn`t matter and you`re going to watch it only once, then downloading it to your computer vs streaming(technically just downloading it temporarily in your web cache) would take up equal amount of data. :)