Right, the word transport is likely not the most accurate, since the computer HD actually stores and serves the music, the SB3 acts as a receiver, preamp, DAC.
Music is ripped to a hard drive on a PC. The Slimserver s/w, installed on the PC, is used to replay the music. The computer serves the music, either via ethernet cable, or wirelessly. The SB3 acts to receive that broadcast, and then either via digital, or analog, acts as a preamp.
I am ultimately not sure what all the differences between Vinnie and Wayne's work are, but there are folks around who have owned both, or compared both etc.
I doubt you would go wrong with either, but if you research the goals of each modder, you may find that one suits your direction more than the other.