Given the requirement for high-speed writing and updating of a vast volume of data, performance is the key consideration, not cost. Cloud Bigtable is Google's premier solution for ingesting and analyzing large quantities of time-series data from sensors in real-time. It is specifically designed to handle the rapid influx of IoT data, enabling the tracking of both normal and abnormal behaviors efficiently. While other options like BigQuery, Cloud Storage, and Cloud Datastore can manage petabyte-scale data, they do not match Cloud Bigtable's efficiency in processing time-series IoT data. Reference: Cloud Bigtable Documentation