Gopher,
The duet can only play up to 24/88 but is far easier to modify hardware wise. The Touch is a linux computer and so has to be software modified. Recall that the Lampizator is concentrating on only the SPDIF (digital) out mods, as he does not care about analog out.
The Duet can have its VERY dirty (wallwart) power supply changed, SPDIF caps upgraded, new master clock inserted with separate power supply, then the digital signal is buffered thru a digi-lampizator section before being output. There is a detailed article about this in the DIY section of his site.
Please note, I am not making any claims about superiority vs Wayne's reportedly excellent offerings, just clarifying the original question based on my understanding from Soundcheck and the Lampizator. I have a stock Touch and a slightly modded Duet with linear PS and upgraded caps. I have never personally heard the Lamp nor a Bolder modded unit.