Where can I find a detailed comparison of Linux distros?

Distrowatch has a good summary of most distributions. I don't believe you can do side by side, but of you want to click through various distros it might be a good resource.

https://distrowatch.com/

Try Googling for comparisons between Linux distros (e.g., Debian vs. Ubuntu) and you get dozens of hits that are about 200 words and talk about the GUI and package installer. I want to know more than just the topical issues. I know that some distros compile with different networking #defines, others have different service control, and important low-level stuff... But it seems there isn't a deep-dive out there, just lots and lots of chaff.