Click on each Sony link and you can do a side-by-side comparison. The "S" is the basic LCD from Sony, which is a very good TV. The "W" has 120Hz Motionflow, has true 24p Cinema mode which is ideal if you plan on hooking up a 1080p/24p source like a Blue-Ray player, has a better Bravia processing chip, better contrast, and a few other items. You can't go wrong with either. It just depends on the features you need. I personally was about to buy a Panasonic Plasma for the bedroom, but after taking a close look at a friends Plasma, I saw image retention issues that scare me because I still watch a lot of 4:3 material. Anyways, I will be buying either the "W" or "Z" model from Sony, but I prefer the 120Hz display and I will have a Blu-Ray player hooked up so I want a true 1080p/24 display.