Mukurtu seems to be a very useful site, similar to Omeka. Mukurtu does have some unique feature such as:
- media assets
- communities and protocols
- item sharing
- traditional knowledge field
- Cultural narrative field (used for historical context)
- keywords
Mukurtu is a site aiming to empower communities to manage, share, narrate, and exchange their digital heritage in culturally relevant and ethically-minded ways. This is different from Omeka in that Omeka is open to communities such as religious studies. Mukurtu seems to be very good at the specific topics they aim to share about. Omeka might be a better platform if you are considering doing something not related to culture and ethnicity. However, if you are planning on presenting data about what Mukurtu is aimed at, then it will be a better site to use.