I’ve been using Feeder for a while now and really like it. It’s free, has a simple but solid UI and all the features I want in an RSS reader. It’s available through F-droid, the play store or you can get the latest APKs from the GitHub project.

https://f-droid.org/en/packages/com.nononsenseapps.feeder/

The only Android specific feed I follow is Android Police.

Out of curiosity, what RSS app are you using?