There are several AI behaviour tree packages available - what are some considerations to choosing which one to get (especially those that don’t offer trials)?
There is two that i could advise you :
Rain which is free, its like playmaker you can do almost everything but it workflow is a default for me
Ai behavior made easy which is not free, but have many included states, website with tutorial and its very easy to extend. And i found the worflow good when you work with many different enemies types