Youtube is the best while it comes to watching videos online because of the following reasons:
Quick to load: It takes literally no time to load.
Versatility: There are few videos that are not available in youtube.
Ease of access: Even old people can access youtube easily.
Related search: If you are watching something and you like that topic you will get thousands of related videos.
5. Upload: You can upload your own videos and earn money.
I will recommend Youtube to everyone.