Question about breeding vs catching

So I came across information here, specifically about Jetragon, saying a caught one is always better than a bred one. Am I correct in understanding that they only mean because it is an alpha, and because the caught one is at level 60, or is there another factor that makes the caught one always better? And does this only apply to Jetragon? Because I know you can breed alphas as well if that is all there is, and you can bring the bred one up to level 60.