why not both? People may want to propagate pornographic content via specific relays, but still have it NSFW tagged via the client, and toggle that when applicable to their situation.
Discussion
It would be ideal to label it correctly and publish it in specific relays for that, but I cannot force other users to label their posts or restrict them from publishing this content to only these relays... I just need better tools to work with what I consume
It should be both. The pr0n relays would autotag anything with media with NSFW on case a note gets broadcast to non-pr0n-specific relays.