From personal experience, as a customer who once did something stupid: Google Cloud does soft deletes. But you need to reach out to support fast enough. And really, if you deleted something important and discovered it only the next day, and not within minutes, you're having a bigger issue that a soft delete won't solve.

It’s a good question. That said unless there are compliance or fallback concerns i would prefer a service that burns my data on departure.

Either mark-for-delete has the same impact as deleting in terms of shooting all the Cloud resources associated with the subscription, at which point the outage still happens but maybe the recovery is smoother or you've just delayed the inevitable by a week because no one will look at it unless there is actual impact.