Onkyo ND-S1 vs Wadia 171

Hi there. Please, could you tell me sincerely, whats the difference from Onkyo ND S1 iDock and Wadia 171? I know Wadia costs more than double but what about the sound quality? I got a hi end stereo system and would like to transport my Ipod musics to my DAC. Let me know if the sound quality of the Wadia is much better or not.RegardsRicardo
Hi there.I'd like to buy a Ipod transport to connect to my Wyred 4 Sound DAC .Please, could you guys tell me whats the difference from Onkyo ND S1 iDock and Wadia 171? I know Wadia costs more than double ( almost 3x) but what about the sound quality? I got an W4S integrated, pair of Elac BS 244 and a DAC 1 upgrated. Let me know if the sound quality of the Wadia is much better or not.
Is there any other option ?

Regards
Ricardo