Historically whole swaths of onions have been effectively blocked due to Tor being DoS attacked. While ~zero LN related stuff has DNS blocked (or blocked by certificate authorities. So Tor loses on that count.

Overall, DNS itself is more decentralized than Tor in terms of number of points of failure (there's a _lot_ more root servers than Tor directory authorities, and also a lot more domain registrars to choose from). OTOH, Tor tends towards "all-or-nothing" failure modes, as it's much harder for the people running Tor to block a specific service.

In practice of course the internet itself is arguably a centralized system due to how IP addresses and routing work. But no-one has really tested that politically so it's quite possible that attempts to censor via that level fail and the internet fragments. We really don't know.