A human, including its brain, is the best general-purpose device for transmitting genes, but the human brain lacks structures that would be useful to an elephant, and vice versa. Brains are not general-purpose devices.
Consider my dog: the surface area of his nose is probably about the size of a football field and I would bet his olfactory cortex is about the size of his visual cortex (in some breeds, it's probably even larger). Of course our visual system is more dominant than our olfactory system. So that's a simple example...would you really call one of them "inferior" to the other?
[Edit: fixed the amusing typo "hill-sliming" -- we are not snails!]