You need to provide more info. Sony has several versions of the SXRD sets available right. Samsung offers many versions of rear projection televisions.
I have a Sony KDS55A2020. I have no complaints. A great set that I got at a great price.
When I bought my Sony I was waiting to see some new Samsung rear projection models that are powered by LED's that will not burn out. My Sony has a bulb in it with a lifetime of about 7,000. It'll cost about $250 to replace.
I got the Sony becauuse the Samsung's weren't available.
If you can, go to a store where they'll put both sets side by side. That way you can make a better choice.
If you decide between specific models check out CNET for reviews on that model. Also, put up some posts here. There are a few people who frequent this site who really know what they're talking about.
Have fun figuring it out....
I am comparing these two sets and would appreciate any feedback on picture quality, features, etc. Thanks for your input!