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.

Yep, neither one is really innovating, except for the examples you named.

Airpods are in a category of their own. Multibillion dollar business that redefined the headphone industry

Great as a business and it's made well, but not much interesting for tech.

I am consistently surprised by the battery life and quality of noise cancellation given their size. Although none of that is revolutionary and just improving on existing tech, I think the complete package (hardware+software integration) was leaps better than what came before.

That's a brand thing, not innovation

There's one thing that made Google great and it was search. It's no longer great and hasn't been for some time. I don't even think it's entirely their fault, but their brand and sentiment has taken a hit from that.

Also, the data harvesting is much more common knowledge.

Apple has been increasing their own data harvesting and advertising, so same shoe different foot.

Google Cloud is fantastic compared to the others. I don't know why people still go to AWS, nothing interesting has happened, it seems like very little has changed. My biggest gripes are the cookie cutter EC2 vs the flexibility of GCP VMs and the account/project switching in AWS vs GCP.

Google is also one of the few companies at the forefront of AI. There is definite innovation there.