I have a scenario where i'm checking for a operator in one class whether he is on the db and if he is not i want a value to be passed to another class saying that that operator does not include in that group
so what should i use a local variable or a parameter value
I believe you can be using both. The local variable will only be available on this activity context where the parameter value can be passed to other activities as well. So it depends if your process is executed on this activity only or if you need to call multiple activities or flows.