I run a few groups, like @fediversenews@venera.social, mostly on Friendica. It's okay, but Friendica resembles Facebook Groups more than Reddit. I also like the moderation options that Lemmy has.
Currently, I'm testing jerboa, which is an Android client for Lemmy. It's in alpha, has a few hiccups, but it's coming along nicely.
Personally, I hope the #RedditMigration spurs adoption of more Fediverse server software. And I hope Mastodon users continue to interact with Lemmy and Kbin.
All that said, as a mod of a Reddit community (r/Sizz) I somewhat regret giving Reddit all that content. They have nerve charging so much for API access!
Hopefully, we can build a better version of social media that focuses on protocols, not platforms.
What I'm really impressed by is being able to follow Lemmy communities from within Mastodon... e.g. by searching @technology@beehaw.org I can see threads and posts without leaving my Mastodon app of choice (Tusky). It's amazing how it just works.
When I tried that all I get are the comments from all the posts. I'm using the Mastodon website, so maybe it's your app. Are you see all comments in your feed or just the posts?
I see the posts with all comments as replies, but it does take some navigation to see everything, like a twitter conversation. It's less intuitive than the nested comment layout but the content seems to be there.