Fusion 878? I think that's a rename of the ancient bt878 chip. Hauppauge's WinTV-Go uses it, and as far as I can tell it's an upgraded bt848, which, on a side note, never had official Win2k/XP support. And the WinTV Go has been around since at least 1999.
As far as I know, the bt878 was meant for budget boards.
Theater Pro, hell, it just
looks newer. BGA package too.
I don't suppose you've got a WinTV PVR-250 or 350 laying around, or any other TV tuners?
Nice comparison though. Sure does show the difference.