Underwater Dreamsex I find rather underwhelming, a bit of an also-ran. I much prefer IASW as the song itself is a bit more imaginative and catchy. It's oddly reminiscent (to me at least) of late Ultravox. If you dirtied it up a bit, put it on a cassette and then told me it was a rediscovered Ultravox demo from late 1978 I'd probably believe you.
Whilst I am at it, I also reckon that Sideways is the best JF/LG album to date. "And the world..." is great and "Neuro Video" just awesome. I have always been a bit wary of the 'banging choons' side of Foxx's stuff so it's a great relief to me to see a return to good, strong song-writing.