How can hybrid companies claim to have the best hybrids and have the test plots to prove it?

Each hybrid performs differently under climate, pest, and disease pressure. For most varieties it's possible to find a test where one hybrid outperforms all the others. Smart growers seek out varieties with consistent performance at many locations over several years. CropFax averages yield trials from many different sources, singling out the consistent performers. In other words, we don't pick a hybrid just because Company X says it's good. We look at trials from competitive companies and universities for the same hybrid. Don't bet your farm on a single test!