I am helping a family member purchase a new 750Li. He has never before driven a BMW, has always been in a Benz. His recent past experience of benz ownership has not been great. The new S just came out. The next gen 7 series will be out in 2008.

Is it recommended to get the new S550 or the 750Li? Anybody here who has driven/owned both? Advantages /disadvantages of getting one over other?