you cleary stated that you would compare your STOCK system to any HU's(I'm assuming you mean Head Unit. Give us a freakin break with the grammar lessons we all know what we are referring to here) internal amp.
So If I am assuming correctly, I would think that you would be talking about comparing your RF(Rockford Fosgate) radio to another radio(the alpine 9835 in this situation). If I was wrong and I took what you said in its literal meaning, you would be comparing your whole system to the actual amp(amplifier) inside the alpine radio. That would not be a fair comparison since the alpine amp doesn't have speakers, wires, buttons, or a readout, so of course yours would be better...
Now if you don't have a STOCK setup then it of course it is probably better. but who cares... that's comparing apples and oranges.