I didn't ask for you to tell us how you feel. Clearly you are scared that by answering my questions, your lack of knowledge will make you look bad. Or at least highly illogical.
So let me help you. Before you go and act as a proxy for someone this way, spend a bit of time satisfying yourself that you are not being used. Let him be the only one embarrassed if he is wrong. Don't join him blindly, pun intended. Remember, the odds are hugely against Marv being right.
I suggest you ask Marv to teach you how to recognize those two amps. Then you do the comparison in your home when no one is looking and see if you can pass such a test. I have the outline here in this
youtube video on blind testing of audio products:
You will learn a ton in the process and will be able to follow what I and
@solderdude are trying to explain to you. Once you have passed the same test, then you can present that fact to us and we will take you more seriously. Right now you are just talking saying nothing useful.