About "Why uBlock Origin works so much better than Pi‑hole does?"

Off the top of my head:

• Cancels network requests early within the browser
• Pattern-based filtering on whole URL
  • example: &act=ads_
• Context information
  • example: $script,third-party,domain=imgbox.com
  • point-and-click to enable/disable blocking behavior on a per-site basis:
    • JavaScript
    • Large media elements
    • Remote fonts
    • Etc.
  • you can see what specific network requests are made by what specific page, i.e. you can fully inform yourself of what specific pages/sites are causing your browser to do
    • example: https://twitter.com/gorhill/status/934474012377444352
• Ability to redirect to neutered version of a resource
  • example: ||google-analytics.com/ga.js$script,redirect=google-analytics.com/ga.js
• Cosmetic filtering, i.e. the manipulation of DOM elements in the browser
  • example: ##.AdHeader
• Scriptlet injection filtering, i.e. the injection of JS scriptlets to modify the behavior of a page -- useful to defuse anti-content blockers
  • example: wallstreet-online.de##+js(nostif, userHasAdblocker)
• HTML filtering, i.e. the removal of DOM elements from a document before it is parsed by the browser
  • example: wetteronline.de##^script:has-text(runCount)
• Ability to deal with unwanted popups
  • example: &link_type=offer$popup,third-party
• Ability to remove tracking parameters from websites
  • example: ||wuzhuiso.com^$removeparam=src
• You can easily (narrowly/broadly) override any filter from the filter lists through simple point-and-click operations to customize your own filtering or to quickly fix sites broken as a result of overzealous filters

Main advantage of Pi-Hole is that it filters network traffic from all devices on your network, but filtering is blunt compared to what you can do through a browser extension.