I think it is true that a younger plant seems more vigorous and grow faster. But as they age their growth stabilizes, that's usually when clones are taken and this can give the impression that seed plants are healthier. Remember, the clones are the same genetic age as the first mother plant they were taken from. It would be interesting to compare two plants growth rates one from seed and one from clone but it would be very difficult. I notice slightly different growth rates in batches of clones that are genetically identical grown under the same conditions. Growing one from seed and comparing it to a clone rooted at the same time doesn't really take into account the likelihood of the seed plant being a different phenotype or slight variations in the growing environment. I suppose if you were very familiar with a strain and could start several seeds at about the same time then select the phenotype plants that closely resemble your mother plant you could get a pretty good idea but all things being equal I bet the yield would be pretty similar.
I agree with THG the real benefits of cloning are the ability to really get to know a particular plant. Even within a strain, there's a bit of variation from plant to plant and growing it out repeatedly is how you can really get things dialed in.
I agree with THG the real benefits of cloning are the ability to really get to know a particular plant. Even within a strain, there's a bit of variation from plant to plant and growing it out repeatedly is how you can really get things dialed in.