SG, you haven't mentioned a specific receiver for comparison, but in general if the respective units have similar maximum power capacities there's no good reason to expect that the separate units will somehow result in better sound. If the receiver amplifies transparently with flat frequency response and inaudibly low noise and distortion within the designed limits(typical these days), there's no magic that occurs when using two or three boxes instead of one. Slightly better measurable numbers(which may or may not be the case)don't result in an actual audible advantage in such a case.
