Because it's much older in antiquity than Atlantis.
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It seems plausible somehow.
A man I knew used to tell me things about my life that he couldn't possibly know. We met thru work after I had moved across a continent and he couldn't possibly know. After a while he also explained that I was a very old soul. I asked how old and he said I was from Lemuria. I'd never heard the name before. Also that I'd lived many lives since then. Through books and educating myself I learned of Lemuria and want to learn so much more about life there.
Because Lemuria isn't well known while Atlantis is
Lemurians held higher spiritual principles. Atlanteans sought control and domination.
Almost a toss up. I am not that familiar with either to prefer one above the other. Understand that there may be reminent civilization of descendants of Lemuria residing presently on the interior of the earth. Both seem fascinating to contemplate.
I have not heard much about Lemuria but atlantis is known to me!
Because lemurians as believed have a psychic abilities and may explain why some Pacific ring dwellers have the abilities
It could be the cradle of civilization.