Assign Task simultaneously

Hi,

I want to assign the task two users simultaneously and complete the task if any one of the user completes.

users are selected at run time.

Example : looking to implement the below steps. 

#1. Assign the Task to A & B

#2. If A completes then the task should be removed from B.

#3. If B completes then the task should be removed from A.

Option 1 : Gateway (or-wait option)

Option 2 : Assign task multiple users.

Gateway : If I use Gateway I can implement Step #1 but not #2 and #3.

   Question : How to remove the task from B's Queue when A completes the task.

Assign Task Multiple users :   

   If I use Assign task to multiple users then I can achieve step #1 , #2 and #3 But I want use the form data which is updated by user.

Question : Here Output property is Task Result collection. So how to retrieve form data.

Let me know your answers or any other solutions.

Thanks

Dhiyane