I miss some content but lemmy has been getting better and better, and after Boost for lemmy I won't ever come back to reddit.

I did at first, but I don't miss it at all anymore. Too many assholes at this point. It stopped being useful a long time ago. Finding old Reddit threads can be helpful sometimes, but current Reddit is a shitshow.

I miss the niche content. Lemmy isn't big enough yet to have sorted into big "stupid" subs vs smaller niche subs that tend to attract smarter and more well-informed users. The result is that the signal-to-noise ratio on Lemmy still kind of sucks and any comment thread is likely to consist of three quarters banal gibberish and condescending idiocy and maybe one quarter actually intelligent, thoughtful and informed opinion.

I rarely make a comment on Lemmy without pissing off people on all sides of any given issue, which tells me that Lemmy's users aren't really good at nuance or complexity.