I took a long time to compare these two vehicles and ultimately decided on a 7. I'm extremely happy with my decision.
Here is some more useful info:
Notice that the S550 comes standard with a lot more items than the 7: - 600-watt surround-sound system (req. Premium Sound Package on a 7)
- In-dash 6-disc DVD/CD changer (req. Premium Sound Package on a 7)
- In-dash SD memory card reader (not available on a 7)
- Media interface iPod integration (req. Premium Sound Package on a 7)
- Zagat Survey® ratings guide for restaurant, golf, and hotels in Nav. (not available on a 7)
- Attention Assist driver drowsiness monitor (not available on a 7)
- Adaptive Highbeam Assist (req. Driver Assistance Package on a 7)
- Automatic trunkgate operation (req. Convenience Package on a 7)
- Soft close automatic doors (req. Convenience Package on a 7)
- Front ventilated seats (req. Luxury Seating Package on a 7)
The 7 comes standard with the following, which a S550 does not: - Auto-hold brake (not available on a S550)
- Premium nappa leather upholstery (req. Premium Leather Option on a S550)
- Keyless Start/Stop (req. Premium 2 Package on a S550)
- Park Distance Control (req. Premium 2 Package on a S550)
- BMW Ultimate Service (not available on a S550)
Options available on an S550 not available on a 7: Options available on a 7 not available on a S550: - Integral Active Steering
- Side View Cameras
- Head-up Display
- Ceramic Controls
- Massaging rear seat
- Smartphone Integration