I've been using an app called Summit for Lemmy, and it feels very RiF-esque. RiF was the only way I used Reddit, and it's made the transition very easy. In fact, in some ways, I feel it's done some quality of life stuff even better than RiF did, like color coding comment chains, which makes it easier to keep track of who's responding to who.
Feedly's been solid after Google killed Google reader. But they've been adding features that make it more similar to Flipboard. I'm also looking for something simple and straight to the point.
I use Feeder, and most sites I'm interested in have RSS feeds discovered if I plug in just the URL of their front page. Other sites can be a bit more of a pain, bit you can often just add /RSS or /feeds to the URL and the readers will work it out.