I really don't think you can go wrong with either. what I'd recommend is going into the store and playing with both (tweaking the colors and stuff, seeing what options are avaiable in the menus). If you can't play with them at least look at them, and check out their avaiable inputs. If you can't do that you probably shouldn't buy (you really need to look at these things first), but if you must, just read reviews online then.
/I have a 46" Sony Bravia
//also had a 46" Sharp which was awesome, except it had horizontal backlight banding issues so I returned it and got the Bravia