I really like Reeder 5 on iOS but I use Linux on my desktop so I’ve been constantly syncing OPML files between that and different web based RSS readers. I used Inoreader for a couple years but it’s so expensive for something that constantly suggests features to try and upsell you to the next tier. I switched to Feedbin a couple weeks ago and I think this is where my feeds will live for now. $50 a year and easy sync between iPhone and random Linux box.