If this is a sarcastic question, which it certainly sounds like, I don't understand your logic. Clovertown is to Kentsfield how Woodcrest is to Conroe. You can't do 8-core with Kentsfield.
If it's a serious question, then Clovertown is the better option, as firstly it will have two CPU sockets, versus one for Kentsfield, and will have twice the cores. It also seems silly for Apple to "de-rate" the Mac Pro to one CPU socket, when it will inevitably be increased to 4 sockets in a year or two for 16-core quad Tigertons.