Which male plant should I use?

Fairly basic, I want to use B, but I just want some confirmation.


I have 2 healthy male Lowryder plants that are about 5 and 4 weeks old.

A is 5 weeks old, tall and healthy, but mostly tall. He is about 10" tall compared to B that is about 4" tall. A has the same number of leaves and nodes that B does but just a little more developed because of the 1 week older thing. B is short, healthy, and well... short. I am breeding Lowryders so the whole name of the game is short plants, so should I breed with B as he is short or do you think the gene pool is well stabilized enough to use A? By the time B is releasing pollen, my female plants will be at the peak time to pollinate:

So should I use A's pollen or wait until B is older and use him? B right?