There are numerous reasons Ubuntu is not ideal for privacy, but it seems to be much better than Windows.
I don’t think you could accurately summarize it in a number. I’d say Fedora is mostly a good step up from Ubuntu, but it also suffers from various usability and security issues:
- It has a much smaller community, meaning you’re less likely to receive tech support should you need it.
- Fedora comes with very minimal proprietary software, meaning you may need to manually install additional proprietary drivers and codecs to have a usable experience.
- Some programs are only officially built as .deb or Snap packages which cannot (or should not) be used on Fedora, forcing you to depend on unofficial builds which can risk security and stability.
- You should avoid installing Chromium or Firefox based browsers as Flatpaks because it may weaken their sandboxing. (This supposedly isn’t an issue on Snap?)
A lot more is discussed in the Ubuntu vs Fedora thread. You don’t have to read the full thread, my original post and my conclusion should suffice.
The security benefits Fedora has over Ubuntu are unlikely to make a big difference in the grand scheme of “Linux insecurity”. Anyone super concerned about security on Linux would be better off with Qubes OS, which is impractical for most people. In my opinion you should only switch if you have the time and energy or if it somehow makes more sense for your threat model, otherwise just stick with Ubuntu.