My advice is make a call and get smoking.
It took me a couple of weeks of swaying between PorQ and WSM before I took the plunge. And believe me, I let it do my head in.
I had finally landed on the ProQ and can't remember what was posted, that shifted me back to the WSM on the day I ordered. It is on a post here somewhere. Think it may have been that someone had both and used the WSM only now. But my impression is there doesn't seem to be enough between them, to justify holding your smoking experience back.
As I said, I got the WSM and haven't looked back but could just as easily got the ProQ and wouldn't have looked back either.
Bit like waiting for that late taxi to arrive. It does your head in, while you prevaricate (did I really come up with a word like that

) but once the call is made, the pain immediately disappears and the fun, fun, fun, begins.
Plenty on here to help you out, whichever you go for and the beauty is, neither is the wrong call.