which consumes più internet/data? downloading o streaming?

It`s +/- same amount of data. Everything really comes down to several factors:
*are te going to watch the file più than once? (If yes, downloading is the best option. If no, then streaming might be più efficient)
*does quality of the file matter? (e.g. if te download file, it will be in the quality it is, while te can adjust quality and stream it in lower resolution, therefore using less data)
*do te have a lot of free spazio for file storing? (If the spazio on te computer/phone is huge, te can surely store downloaded files on there. But if te 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. :)