When comparing OwnCloud vs A Photo Manager, the Slant community recommends OwnCloud for most people. In the question“What are the best open-source Android apps?” OwnCloud is ranked 7th while A Photo Manager is ranked 9th.
Ranked in these QuestionsQuestion Ranking
Pro Open source software
Pro Allows selective sync
Desktop clients offer sync almost as versatile as dropbox.
Pro You have full control with your data
Only chose a provider or host it on your soho-server.
Pro Powerful geotagging/openstreetmap integration
A map shows where photos where taken. if you zoom in you see more details. Geotagging: select one or more photos + "set geo" + pick a point in the map ==> the selected images get that point. Filter images through the map: after selecting an area in the map (i.e. North Germany), the gallery will only show images from North Germany.
Pro Can handle big image collections
15000+ images in 1000+ folders.
Pro Build in Vault mode
If enabled only selected/filtered Images can be seen. This allows you to savley hand over your android phone to someone else and allow him/her to view only those images in Gallery-View, Geographic-Map and Image-View that you have chosen before.
Pro Exif-Tag support (Edit and Find)
Pro It is free
Open-source, no ads, no user tracking.
Pro Quick hirarchical folder navigation
Only folders that contain pictures are shown.
Con Not plug and play as Dropbox etc
You may need some help installing it on your web space, though some providers offer free install server.
Con It is not available on the Google Play Store
You have to download it via f-droid.org store.