peachtree amp vs. traditional amp


OK, I'm a newbie, so this is possibly a dumb question.  I am considering a 2 channel amp to listen to music (Tidal or spotify).  I am looking at a traditional looking black box amp by Yamaha or Marantz.  But I've also seen a very small amp by peachtree.  The peachtree seems to be about the same of watts as the others.  How would the sound compare?  It seems that the peachtree is so small, it would not have the same power.  Doesn't size/weight translate to some level of power?  Anyways, has anyone compared a peachtree to a traditional amp of the same power rating?  Please share thoughts.
dougmint
I have a traditional Odyssey Tempest preamp and Stratos amp setup in my living room. It sounds excellent also. I have had Devialet 400 class D that I grew to be unsatisfied with. I can only speak to the Peachtree Nova 300 driving Salk Song3 speakers with Transparent speaker cables in my bedroom. I am getting really satisfying sound from them. I am starting to realize that there are tons of great products out there that put in the right room can sound excellent. The room is as important as anything else. 
   
anyone knows who makes traditional amps and where to purchase these and what are these?
czarivey:  By traditional amp, I mean the black box amps, made by Dennon, Yamaha, Marantz, etc.  They all kind of look similar.  Usually priced $500 to $2000.  Can be found a Best Buy and Crutchfield.
@bubba12Can you expand on why you grew tired of the Devialet. I am considering this integrated for a future system just for the convenience factor. I have heard this unit and it was OK. I rationalized the convenience would override the OK sound I heard.

BTW - I thought the Devialet was a hybrid Class A and Class D amp.
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