Hard to say. You've got tradeoffs either way - the Sony has Sony's image processing, which tends to be good. It has an LED backlight, for what that's worth, which at that price point is basically "says LED on the box". The Sanyo has 120Hz refresh and is a larger screen.
Arguably, they're only the same price because one is a Sony and the other is not. I'd look at them in-store and see which you prefer, if you really must buy one from Wal Mart. IMO, the selection they have sucks, and for that general price range I'd just go look elsewhere. This maybe.
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