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[In my experience] Cost can easily get out of control with multiple trails on full logging Logs can
For the latest information on pricing, visit https://aws.amazon.com/cloudtrail/pricing
You can view, filter, and download the most recent 90 days of your account activity for all management events in supported AWS services free of charge. You can set up a trail that delivers a single copy of management events in each region free of charge. Once a CloudTrail trail is set up, Amazon S3 charges apply based on your usage. You will be charged for any data events or additional copies of management events recorded in that region. In addition, you can choose CloudTrail Insights by enabling Insights events in your trails. CloudTrail Insights analyzes write management events, and you are charged based on the number of events that are analyzed in that region.
The following is a quick overview of editions offered by other software in similar categories