Which is better sealed or ported box for jl audio w3 10 inch sub?

With ported boxed they usually are louder but only at frequencies they are tuned to. Sealed will pretty much reproduces any frequency at the same level that the sub can put out. If your building the boxes yourself I would suggest making them sealed because when you make ported boxes the port has to be set up right or it will make your subs sound like junk. With sealed you should make the box to the manufacture recommendation square footage and it should sound great. I personally use sealed for my dual 10'' subs. I would only use ported if i were to upgrade to dual 12's or something bigger than what I have. hope this helped. good luck!