Neither of those two are good for low light, unless you're going to use the flash in all low light or indoor shots. Ones to look at are the Sony HX5, Sony TX1, Canon S90, and Canon G11. They all use the Exmor-R sensor, which makes them much better in low light than the average point and shoot.
I am looking to get a new digital camera. I would like an advanced camera with good picture quality and good at taking low light pictures. I have been going back and forth between the Nikon P90 and the Canon SX20 IS. Would like to know what people think about them or if they know of any other camera that would be good for me! Thanks!!

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