NetworkManager and networkd are being debated as possible replacements for ifupdown in Debian trixie. Some users prefer NetworkManager for its ease of use, while others prefer networkd for its simplicity. Controversial aspects include networks that block ICMP or drop unrecognized traffic. Interestingly, some users believe they don’t need to understand congestion control or resort to opening multiple TCP connections to get desired speeds. Overall, the debate continues on which network management tool is the best fit for Debian trixie.
https://lwn.net/Articles/990281/