Was interesting to read that Tom Cockerill test ran a cab forward shell on his Cat, but decided it didnt make enough of an advantage to keep it and has returned to the standard.
My choice would be for the bulldog style as I can see this giving more downforce where its needed (i.e. at the front) - its just unfortunate that it looks ugly as sin!
The finnisher looks way better but too far back to make a big difference I would have thought.