The snarky answer is "literally all of them", but one real answer is that I've been pretty happy with GCP's status reporting for the past year-ish I've used them. I've only noticed a few incidents, but every time I've checked the status it was already updated. They also occasionally provide workarounds on the live incident pages if you need to be back up before the issue is fixed on their end.

stop.lying.cloud is the accurate AWS status page.