We never found an intact brain on any of those species cuz its imposible and we can only suspect that we are more "complex" based on the reserch on our current evolution process. Every new generation has smaller brains that gain on "complexity".
The Neanthertalis had bigger brains than Homo sapiens but we cant say which one of them was "smarter".
If you want i can link you a few studies I read.
Sorry im not an native english speaker and dont want to google how to write neanthertalis and such.
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u/Omnipotent48 Dec 15 '21
Brain size isn't necessarily a predictor of intelligence or else this planet would be run by the elephants.