It is similar to Lemmy in that it’s also a link aggregation platform. What makes it different is that it is created by different people using different code and has different priorities. But the same basic features are present.

I can’t speak to why it might be better than Lemmy because I don’t use it. Maybe some people think it’s better because of the features it offers. Maybe others don’t like the Lemmy devs and prefer supporting a different application. There are lots of possible reasons.