Compare Bob Carver Black Magic 25 and Rogue Stereo 100?


Can anyone help me decide which tube may sound better, a -  Bob Carver Black Magic 25 or Rogue Stereo 100?  I will match either/or to :Martin Logan 20i.  Carver is new but only 20wpc. Rogue is used but 100wpc.  Both are online so no way to audition.  Thank you all for suggestions.  

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Holmz - the OP (Buyer) is not simply speculating when he says he has not heard either amp mentioned here.  The OP (Buyer - Me) can tell you I have NOT HEARD either product and that is not speculation - it is FACT.  I think I should know.

Well, thank you all so very much.  Your thoughts and ideas have made my decision an easy one to make.  I appreciate all the help - Thank You!