When comparing uBlock Origin vs Video DownloadHelper, the Slant community recommends uBlock Origin for most people. In the question“What are the best Firefox add-ons?” uBlock Origin is ranked 1st while Video DownloadHelper is ranked 18th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Open source
Pro Light weight
Pro Promised to remain commercial interest free
uBlock will remain free from any commercial as stated by the creator. uBlock is meant to be strictly for the users and completely free.
Pro Lots of advanced features
For example, you can add more items to your HOST files like disable social tracking.
Pro Thoughtful UI
Its non-invasive design shows you how many times something's been blocked on a given web page – that number quickly jumps to the double- if not triple-digits in some cases.
Pro Can be used on Firefox Mobile
Pro Detects skimming
Skimming means replacing links so that they are rerouted, this is mostly a more friendly way to make money than showing ads.
Pro Edge version
Also available for Microsoft Edge browser.
Pro Works with YouTube videos, and most other sites too
A number of "YouTube downloaders" will only work with YouTube. Others (maybe the same ones!) no longer work with YouTube after changes were made in the YouTube interface and encryption. But VDH just keeps on working!
Pro Rarely fails to "see" and download video and audio streams
Many similar tools will often fail to download certain video formats or DRM protected streams. VDH fails to download 5% or less of video streams.
Pro Conversion license is very affordable ($15 lifetime license)
Pro Automatic conversion rules are very handy
Cons
Con Pricy
Con UI for advanced features is a little hard to navigate
There are much worse UIs though.