What is the best down loader for YouTube?

Well, there are a lot of YouTube downloaders online. But if you are looking for the best, it depends on what you are looking for. Personally, I use AceThinker Online Video Downloader. It's a web-based tool that also supports various websites aside from YouTube. Also, as a person who doesn't hassle with installation, I prefer this one because I can access it on any device. Not only that, it lets you download videos in various formats like MP4, AVI, MKV, and even audio formats like MP3.