What I like most about Gatling is the flexibility and freedom it gives you when designing performance tests. It makes it easy to create reusable scenarios, build complex test chains, and structure tests in a maintainable way. The ability to use a real programming language such as Kotlin is a major advantage, as it allows for advanced logic and customization that would be difficult to achieve with more restrictive tools. This gives me full control over how I design, organize, and execute my tests. I also appreciate how clear and intuitive the reporting is. The reports are easy to understand and communicate to both technical and non-technical stakeholders. Overall, the coding-first approach and the level of control it provides are what make Gatling stand out for me.

I like the flexibility I get in implementing data generators (feeders). This allows for representative and sufficiently random data that ultimately gives meaningful performance test results. I also like the simulation run management and history offered by the enterprise product which lets non-engineers to access and use the results directly. The technical documentation is an ever-evolving artifact but in its current state it is useful and well structured and helps newcomers create effective simulations, not just "hello world" versions.

The integration with other tools, along with the out-of-the-box reports, is what I like most.