For me it simply came down to the fact that I prefer the layout, and it's also nice knowing I can block whole domains (looking at you, furry spammers). It also integrates with Mastodon if that's your thing (it's not my thing), and I have high hopes for the ability of Ernest (the founder and only dev, to my knowledge) to usher it in a good and healthy direction. I can see all content from Lemmy and interact with it though, so it really just comes down to personal preference.