Difference between generator extension cords?

240 generators are actually two 120 volt generators connected to a single shaft.

The L14-30P type cord uses both legs, in other words, if you had something plugged into all four female positions you would be using both of the 120 volt generators to run four total circuits, each half of your generator supplying power to two of the female ends.

The other cord would only be plugged into ONE of those legs, using only half your generator to run three circuits.

On your generator panel there will probably be some distinction between the legs. You probably for instance have at least two 120 volt plugs, one for each leg, and a 240 volt plug, that combines both legs and hence gives you 240 volts.

Ideally, you want a balanced load between both legs as much as possible.

In practical terms, there would be no load difference on your generator between using both of the 120 volt plugs, or splitting a single 240 volt plug. It's just a matter of how many cords you want to run.

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Difference between generator extension cords?