There is an interesting shift that takes between the style of experience in Unity and the style in Brahman.
In Unity, we progressively become whatever we experience. Perceptions, memory, the whole works – as we experience it, we recognize we are it in the most profound, intimate way. Simply living life, we gradually come to know the entirely of consciousness (Atman) until we know ourselves as both global awareness and all points within that. Of course, some will frame or emphasize this process a little differently – like with being or inclusiveness. The dominant theme though is a growing Oneness or uniting with all.
With the Brahman shift, we switch from knowing ourselves as consciousness to knowing what is beyond consciousness, beyond being. We come to know the totality greater than everything. Brahman is the knower of Brahman.
But in Brahman the process is not uniting, it is “devouring”. Brahman is the eater. Again through simple experience, everything is recognized as That. What had been recognized as being is now progressively recognized as nothing.
In a sense, even experience itself is devoured into simple knowing.
While this may sound like a bad thing, it’s actually quite remarkable, eventually becoming delightful. This is because that “nothing” is not an emptiness but rather a totality, an inclusiveness that unites even the subtle divisions within consciousness and being.
In one sense, we could say Brahman is also a Uniting process, but at an even deeper level. We have united all of consciousness and now are uniting totality. But because That has a different dynamic than consciousness, it is quite different subjectively.