VTL 7.5 S3 vs Jeff Rowland Corus with PSU


Currently  own the Jeff Rowland Corus with larger PSU power supply and am considering a VTL 7.5 S3 preamp. Anyone hear both and able to comment if this would be an upgrade or side step. Speakers are Wilson Sasha DAW with Krell FPB 300c. 
carey1110
I will be auditioning the 7.5 s3 in my system in the future and comparing to the Rowland. I may be wrong but  my thoughts are that the bass will be better with the Rowland than the Tube preamp. I’ll keep you posted when I hear it.
Mildly OT:  does anyone know what brand 12AU7s VTL uses in the 6.5 II preamp?  Much thanks.