I personally would argue the M1 is more interesting than the TPU, but I think the general answer to your question is “nothing”. Apple and google both churn out

I personally would argue the M1 is more interesting than the TPU, but I think the general answer to your question is “nothing”. Apple and google both churn out research, google maybe a bit more. Beyond that though, both of their product lines reach such a scale that requires the tech to be mature (aka no longer an innovation). Apple has really strong chip prowess, eg the M1 or the battery efficiency vs size of AirPods and AirTags. But a lot of that is resting on TSMC which anyone can contract. Google has some impressive research into things like AI, database, K8, etc - but today others seem to be catching up.