Lemmy is a lot “bubblier” than Reddit, I suspect because the communities are smaller. It’s a lot easier for a community to have a preferred view on things, even things you wouldn’t suspect were part of the community’s theme, and if you take the wrong position you’ll get pummeled with downvotes more easily.

Not that it doesn’t happen on Reddit too, but I see it far more here on Lemmy. I’m still active on both and while I haven’t done any formal comparison you’re asking how it “feels” and that’s definitely how it feels. I speak my mind freely on both platforms but on this one I’m more likely to see a pile of downvotes.