So what's the main advantage of this over F-Droid? Theoretically more secure?
GrapheneOS [Unofficial]
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GrapheneOS is a privacy and security focused mobile OS with Android app compatibility.
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This is a community based around the GrapheneOS projects including the hardened Android Open Source Project fork, Auditor, AttestationServer, the hardened malloc implementation and other projects.
AFAIK the main difference is that on F-Droid (at least the main repo), all apps are signed by F-Droid. On Accrescent however, each app is signed by its developer. This can be seen as it being more secure.
If you're further interested in the topic, there's at least one discussion thread about the 'insecurity of F-Droid', I believe also directly comparing it to Accrescent, on the GrapheneOS forum.
What's the difference between Accrescent and Obtainium?
Accrescent has a list of apps that can be easily installed, unlike Obtainium, Accrescent doesn't require the user to spend a lot of time adding each app they want to auto update/install to Accrescent as the apps are aleeady there. Similar to playstore.
Obtainiums only advantage to me is that you can add almost any app source, while Accrescent still is in development and as such lacks lots of apps at the moment.