Hello,
I usually post on the LS forum, but I am looking at a 02 GS300, so I was doing some homework before I bought. I have always loved the Bimmer 7, it is elegant, sporty and fast. The problem comes down to what do you want? The lexus ls is a true luxury car. There is nothing like it. It is dependable, quiet, and powerful enough to get the job done. (I have had mine to 130 mph +) There is no sportyness to it. It just oozes luxury.
If you want pampering and reliability, Go with the LS. You won't regret the decision.