I'd say Temptation hands down.
The ironic thing is she got slammed by the mainstream Jazz press for doing it. I seem to remember there was a nice interview with her in Stereophile about it a year or so ago.
Her latest self titled album is pretty good as well and may be her best jazz album. I have all of her albums on CD, and they are all pretty good. Temptation is awesome on vinyl. Tom Waits is a genius song writer. Funny enough, I heard a few of his songs first on Temptation and then I heard them on his albums, and I could not identify them when Waits was singing. This is how different the arrangements are on the Temptation album.
Keith