But what advantages does friendica have over hubzilla?
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From end user perspective, very similar. It is same dev but he developed Friendica first, and Hubzilla came second as a complete rewrite with the newer Zot protocol. Both interconnect with ActivityPub, Twitter, diaspora, etc. Both have photo albums, calendaring, and events.
A key difference though is Hubzilla has nomadic profiles which serve as a mirrored backup of your entire channel and posts. So if your primary hoster disappears (as can happen in the Fediverse) then you just continue from your other channel backup. This is quite unique. Hubzilla also has some publishing features which are not in Friendica. Friendica operates more a a basic decentralised social network platform.