a difference between flyback and forward

hi friends
i dont know the reason of following text:
"it is also a frequent choice for a supply with many voltages in the region of 50 to 150 W .it is attractive for a multioutput supply because the output voltages track one another with line and load changes far better than they do in the forward types."
can you explain this matter please?

The flyback delivers power to the load during the off time of the transistor and the rectifiers work as peak rectifiers. That means the output voltages follow the peaks of the transformer secondaries during the flyback period.
If you have multiple outputs, the voltages across transformer secondaries during the flyback period will tend to follow one another, because of transformer action. Because of the peak rectification, it follows that the output voltages will follow one another.

In a forward, transformer action is still present, but the power is delivered during the on time and the rectifiers work as average rectifiers. That means the output voltages are the averages of the voltage across the transformer secondaries during the on time. But the averages depend on the duty-cycle. And the duty-cycle is adjusted to regulate the master output. But that means the duty-cycle will only be right for the master output and it could be totally wrong for a slave output, because the output could be fully loaded (needing a large duty-cycle), while the master output is only lightly loaded (needing and forcing a low duty-cycle). Or the other way around: the master is fully loaded, forcing a large duty-cycle, while a slave output is only lightly loaded, thus needing a low duty-cycle.

To improve the forward we use coupled inductors, but they are more expensive, as they are harder to manufacture.