Amazon Timestream is a fast, scalable, and serverless time series database. You might use Amazon Timestream when you need to feed near real time data into a dashboard to reflect current vehicle health status.
Amazon S3 is an object storage service offering industry-leading scalability, data availability, security, and performance. You might use it when you have a scenario that requires batch processing and analysis of vehicle data over a period of time. For example, when monitoring driving behaviors, tracking infotainment interactions, or creating better long-term maintenance plans for electric vehicle fleets.