Reddit does get super echo chamber-y in some places, though. Check out any thread in /r/worldnews lately and all the comments. They’re all of the same opinion. At least on Lemmy I see disagreement. I see as many complaints about tankies on Lemmy as I do tankies themselves, for example. The only one I’ve seen in this thread has all their comments in the negative.
I’d also recommend !trendingcommunities@feddit.nl. They seem to find some pretty good communities.