For a while the co-evolution makes most sense I think. Right now we have augmented intelligence with all our tech, it will just grow from outside our bodies loser connected to the inside.
co-evolution makes sense right until the point right until the point where one becomes dominant and the other becomes a parasite.
That said, our bodies still have things that are practically different life forms integrated into our cells, so maybe the future will be far weirder than we ever expected.
