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It’s different.

Mastodon:

• Zero downtime software updates
• Can scale sidekiq workers and web front ends
• Leverages Elastic Search (optional) and Redis
• Terrible Performance, so the scaling is required
• More complex running and maintenance
• Hard coded character maximum (PRs to fix this have been denied)

Pleroma:

• Way faster, and much more performant
• Lots of more backend features
• Post size limit is configurable
• Has to be taken down to update (I don’t care if it’s “really fast,” it’s still a down-time release).
• Cannot scale at all. You can run one instance of Pleroma. That’s it. No support for multiple workers.

Both have a hard bottleneck of the Postgres database. Both use postgres and postgres doesn’t support multiple masters.