Request-Response in ActiveMQ

Hi,

I want to implement request-response using JMS. I found two ways of doing
it:

1. Using selectors
2. Filter duplicate messages in producer application itself.

Which method is recommended by ActiveMQ vendors ?
What is the performance overhead on broker in case of selectors , because I
think broker has to do filtering for each message ? Does it reduce the
performance by big amount ?

Thanks,
Anuj