*Maybe.
If, for whatever reason, you have to be able to "grow your own", the very best of the meat birds (in terms of rapid growth and feed efficiency) are off the table. and if you are limited for freezer space, then its just not practical to buy a load of meaties a couple times a year with a bulk purchase, followed by bulk processing.
From my own example, I'm hatching anywhere from 6-10 birds every three weeks. On average, half of those will be males. That allows me, on average, to take one young male, and one aging female, out of my flock each week for the table while maintaining a stable flock size across a range of ages, with a constant source of replacements, that allows for small but natural losses to illness, injury, or predator. and it allows me to improve the lot (albeit very, very, very slowly) along the way, selecting for birds which do best under my management conditions.
It really depends on how you want to measure "best". If measured in terms of cost inputs per pound of meat yield or eggs produced? Even free ranging and having no chick purchasing costs, I'd lose out to "purpose built" birds - but that ignores the fact that I don't have the freezer space, and even if I did, I'm not in a position to take on the extra equipment purchase costs to process meaties in bulk, nor do I have a low cost source nearby to process for me. "Best" is a relative term.
Theory and Practice sometimes diverge, particularly when perfect conditions do not exist. We make do.