In general I would say go with the seperate chambers just because the calculations to figure out the port diminsions are extremely complicated from what I have heard/seen. You have to account for a few other variables as I understand/don't understand. Other than that, I see no other reason.
Igitur qui desiderat pacem, praeparet bellum -- Vegetius
"I told her about my conversation three years ago with the political leader of Islamic Jihad in Gaza. "What's the difference between suicide, which the Koran condemns, and martyrdom?" I asked. "Suicide," he replied, "is done out of despair. But remember: most of our martyrs today were very successful in their earthly lives." In short, there was a future to live for--and they detonated it anyway."