"Transport Rule" or "Forward To"

I am using Exchange 2007, and I want all email sent to User A to also be delivered to User B without User A knowing about it.  As far as I know, I have two options, but it is not exactly clear which option would be better.  

Option 1:  Create a Transport Rule such that email sent to User A will be BCC'ed to User B.

Option 2: Forward all messages sent to User A to User B by doing the following.  Go to the Properties of the User A mailbox and edit the Delivery Options under Mail Flow Settings by choosing to "Forward to" User B and being sure to select "Deliver message to both forwarding address and mailbox."

Both options have exactly the same result as far as I can tell, so I was wondering if anyone could tell me what is the difference if any exists.  Why would I want to create a Transport Rule to BCC vs. forwarding the message to another mailbox?  
syn_digillaAsked:
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Option 1 is better in my opinion.     With Option 2 if something occurs on users B mailbox like full mailbox then user 1 will get the notice.  

I guess either way I just prefer to control this type of message flow via transport rule.
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syn_digillaAuthor Commented:
That confirms what I suspected.  I will keep the question open for a few more days to see if anyone else has anything to add.  Thanks.
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Glen KnightCommented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
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