Both should be very close in terms of SQ as both have excellent Burr Brown DAC's in them (2x PCM64P vs. 2x PCM1701P).
Both have the same transports too (KSS-151A) so they're the same in that respect as well.
Me,,,I'd take either,,,no wait a second >>> make that both !!! LOL...
HTH
Bret P.