Im using nextcloud news and the associated app. I like it because it lets me play podcasts in a player built into the android app. I havent found an up to date rss reader for freshrss that does the same (read you is beautiful, but doesnt have this feature.) And I have nextcloud already up so its easy to start with.
Theres also many plugins for freshrss, including one for rss-bridge that turns urls into rss feeds. I use this for youtube subscriptions. You could also use rss bridge independently, which is what I use for nextcloud news.
I think containers get seen as overhead unfairly sometimes. Yes, its not running on bare metal, so theres a layer of abstraction, but I think in practice the performance is nearly identical. Plus, since AIO does things out of the box for you (like a redis cache for instance) it ends up being more performant than a standalone nextcloud instance that isnt configured properly.
That is to say, I use AIO without issues.