Best of the three open source work flow management tool

Which is the best out of the three -

Activiti
Camunda
Flowable

Is all of them support CRUD operation with default search options or filter options for any table or entity defined ?
if anyone of them has it by default, please let me know.
Does anyone knows the differences and pros and cons of the above?
Is there is any other open source is better than the above for java app?
Software ProgrammerAsked:
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