Good day @Matt, and welcome to the Particular discussion forum.
I don’t have any direct experience with any of the mentioned workflow or orchestration engines. I read a bit on their respective websites , and they all seem to solve the microservices orchestration problem. We tend to favor a saga-based approach over an orchestration one, even though sagas can be easily used to build a microservices orchestrator (with no visual support).
I wrote about orchestration in the past: There is no such thing as orchestration, and also gave a talk about sagas: Welcome to the (State) Machine • Particular Software
Let me know if that helps, and if you have any further questions, please, do not hesitate to contact me.