Reviews that I have read elsewhere suggest that the Touch has the best analogue output.
Whilst the remote controller is the sexiest (and most expensive) part of the Duet, you ca always control the Receiver from Squeezecentre on the PC (and probably from smart-phone apps? That I don't know about). ok, there is stuff you can do with the controller all by itself, after getting its headphone socket working ...
But if I was buying today, I'd go for the newer, said-to-have-superior-DAC, Touch.