Whats the best youtube video downloader

I go out a lot and I don't usually have Wi-Fi nor do I have YouTube premium to download the things that I need to watch I don't feel like illegally downloading some stupid YouTube premium just so I can download videos on the go it's really tedious and annoying and I already use most of my gigabytes as it is I just want to Simply YouTube video downloader I give you the link then after I give you the link you give me high quality videos and I get audio with them I don't want to stupid YouTube video without audio why would I want to high quality video If I can't hear what it's saying