Picture This: TV-Output Comparison

The ImpacTV2 is what you can consider the standard for TV output to be.  The image isn't as vibrant as it could be, however it is definitely more than what previous generations of TV output controllers were capable of producing.  Unfortunately, the drivers and technology require the desktop to be fixed at the same resolution and refresh rate as the output display, which unfortunately limits what you're capable of doing while using your TV as an output. 

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The BT869 provided the most vibrant picture of the roundup, although with a bit of gamma tweaking the competition could be brought up to essentially the same level, the Brooktree solution seems to be ideal for gamers.  Most likely why it was used on the TNT2/Savage4, primarily gamer cards.   Unfortunately the picture does change (no pun intended) when you look at the Voodoo3's implementation of the BT869...