Domain Forwarding: Best To Forward? or Leave Both Working?

I am wanting to know which is the best to do..
I have the domain.org working on my website, I have just bought the domain.pw
Both will be attached to the same website, is it best to have the .pw forward to the .org or should I leave it so that if someone visits the .org domain thy stay on the .org and the same if someone visits the .pw, they stay there.
Which is best for me to do?

See original post by Sean101