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I didn't mean add roos, I meant replace roos! Too many roos is not a good thing. If you stick with the ones you have for breeding, you can eat the offspring, they just won't be very big or meaty. But they will be tasty.
As far as which is best, that's highly subjective. Best flavor, best growth, best nutritional value, all these things will vary with breeds, butchering age, and what they eat. A regular broiler type will grow fast, and be tender, but lack the full flavor of a heritage/dual purpose bird. Birds that are active foragers with access to pasture have better nutritive value, better balance of essential fatty acids, etc. So which birds are best for you, may not be the same as what I consider best for me.
Males get bigger, and if they are heritage types, are very lean. My DP roos get pretty big and meaty, but there's very little fat. Broiler types are little fatties, generally. My DP hens do accumulate some fat, and they don't get as tough as roos, as fast as roos, and usually make very nice roasters, if you roast them long and slow. They won't get as big as the roos. So again, it's a subjective thing, you just have to decide what qualities are the most important to you, and go from there. It may help in your thinking to be specific, and avoid thinking about it in loose general terms, such as "I want the best ones". Instead, decide what traits you really want, such as, "I want a lean, muscular bird", or "I want birds with a little extra fat for the flavor and moistness", or "I want a heavy dressed weight", "I want fuller flavor", "lighter, faster cooking bird", or whatever you feel strongly about.
The rangers, such as red bro, or even something like the red broilers (Ideal has them) may be what you want. They grow slower than the Cornish X, but still fairly quickly, and are active , healthy birds. They can breed naturally, though the offspring will not all be like the parents, since they're hybrids. But close enough for home use, anyway.