I'd say the main difference is Lemmy has been around for 4 years and Kbin is only a few weeks old.
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The future of Tildes seemed obvious given the experience with reddit so why bother? Kbin pretty much is Lemmy with a different UI. The structure of Lemmy makes sense, basically it is like reddit except the instances add a new dimension which makes much more sense to me. I know lots of people who would enjoy features of reddit, but don't use it because they don't identify with the brand of reddit.
For me it'd be word of mouth and a more memorable name. It was people making posts about Lemmy over on the sinking ship that caught my attention first and kbin second. Call it lizard brain or whatever but "Lemmy" is close to "Lemmings" which is a game I loved as a child while "kbin" makes the mistake of not being a single, simple word. One sounds personalable and a finished product, the other sounds like the backend of bigger software.
For me it was that it was privacyguides making their own lemmy instance that led to me opting for it as my first introduction to the fediverse. Other than that other subs like piracy set up their own instances and now Android. So I wonder if getting a Lemmy instance set up is easier than Kbin?