This is a though one to answer. I picked to wait because that is what I would want done if I was posting a trade.
That being said not everyone plays by the same rules, so I it is up to the individual trade. I know that you usually like to have in your threads when your decision will be made, but I don’t know how many trade offers I have out there that I have no Idea how long I have to wait for that decision to be made. So if you want to wait until they are closed you maybe waiting a long time. I say if there is a thread on the same item and that thread has a expiration date in it then wait until that thread is closed. If there is no time limit on it then go ahead and start your own.
Just my thoughts,
Goofy