It's similar, but not that good as Mobilizon, Im focusing on simplicity with an improved UI and experience.
I'm assuming easier to spin up a new instance on your own, but this is my personal opinion.
Do you have plans for adding ActivityPub support in the future? That would be very cool, and having interop with these other FOSS projects will help give things network effects.
Mobilizon looks interesting but their docs results in a 404, which doesn't inspire confidence.