ARC LS26 or Parasound Halo JC-2 with HT bypass?

I am in the lucky position to choose between used versions of these two great preamps but I don't have the option t hear them in 'my' system with 'my' reference recordings. So opinions will have to do.

My system:
- Sony BDP-S790 (CD/SACD)
- Cambridge Audio Stream Magic 6 (DAC for CD, stream hi-res FLAC files)

Power amp: Bel Canto Ref1000M Monoblocks

Speakers: Thiel CS7

So which of these lovely preamps (ARC LS26 or Parasound Halo JC2) would you get and why?