Choosing between Lambda functions and activities

This document is a work in progress:

Features	Lambda functions	Activities
Access to specialized hardware	In Lambda function you can't access specialized hardware (e.g. GPU)	In self hosted activities you can have access to specialized hardware
Cancel the running task	Not available	You can cancel a running activity
Timeout the running task	Available, you can configure the Lambda function to finish within a specific period	Available
Scalability	Available, out of the box	You have to put the efforts to start/stop additional workers
Human approvals	Available, Guflow provides intuitive signal API to support human approvals	Available
Choice of programming languages	You can write the Lambda functions in good number of programming languages	Guflow provides you rich APIs to develop the activities. Hence your first option will be .NET.
Cost*	Likely to be low because you will pay only for the time when Lambda functions are executing	Likely to be more because your worker machines(docker or EC2) will be up and running even when there is no active workflow

*You should evaluate cost in your case independently.