I have used only Open Source version in few of my projects. I have used both Scala and Java versions. It's quite easy to set up, DSL is rreach. Compared to GUI based tools here we have code - so one can apply all good coding practices and IDE support. It can be easily integrated into your CI pipeline.

Lightweight tool can simulate larger Number of virtual users from single load generators machine It's reduce cost for investment in hardware components

java/maven tool with posibilites integrating into current java projects (with a maven plugin help). Native integration with Github Actions. Gatling enteprise provides meaninful graphs & stats for A/B testing. Gatling Enterprise support is responsive and valuable.