Line Preamp Pass XP 20 or VTL 6.5 Signature

Dear Friends,
I like to know from your experience which Line Preamp will be better from Pass XP 20 and VTL 6.5 Signature,to combine with Ampli Pass X 250.5,Cd Player Wadia 581i Se,Tannoy Dc 10T.

Many thanks for any comments and suggestions

Regards

Alberto
Italy