I use AWS Lambda because it is the most mature of the major cloud platforms for serverless functions. The fact that you can add VPC configs at the start is huge from a security perspective. However, it does take a lot of work to configure the Amazon VPC to work with AWS Secrets Manager and Lambda. It's also nice because it works so well with Amazon API Gateway
I typically use it to connect with databases to insert and extract information for downstream analytics.
I won't be surprised if one day the majority of workloads run on this service. Not having to manage and maintain infrastructure is truly a blessing.