I've been trying uBO Lite myself for a few months, and anyone who uses YouTube will absolutely notice that it's worse at blocking. Lite tends to delay playback at the start of a video for as long as the blocked ads would've been, making the site feel slower, and once in a while an ad will slip past the blocker anyway.
I am not so sure if that is the light version. In my (outdated) Ungoogled Chromium which still has classic uBlock, YouTube videos also have delays or do stop playing completely after a few seconds. So I have switched to the FreeTube software to watch YouTube videos. I can recommend that.
