I don't know if any of the hotels have their own shuttles. All the times I have stayed, I have always taken a taxi. The taxi are fairly inexpensive and everything is pretty close, so its not too big a deal to pay for a taxi.

Given that your only staying one night and you have elite status with *wood, if the Le Meridian's rate is as good as you can get, then I would probably stick with it for your stay. The Marriott is an OK hotel (nice, clean, Marriott consistent) with a great location. But I do believe the Le Meridian is also on Orchard rd as well, so its location should be pretty good as well.