There's no difference in the yield that you can get from a seed or a clone. Seeds are just that... a seed, that you'd have to germinate and grow for at least a month before you could start to determine whether or not its a female. If it's not, then you just wasted a month or more of grow time. Clones are cuttings taken from female plants that are forced to for its own root, thus making it its own plant as it grows. The benefit of taking clones from a mother plant is that you're guaranteed a female. It still takes time to grow the clone through the vegetative stage, but at least you're guaranteed a female. Yield doesn't matter when it comes to whether the plant was a seed or a clone. The yield is in the grower, and the health and nutrition of the plant!