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I'll second that emotion!
coturnix are hands down the best meat/eggs game birds for the time and money! In accounting terms, "The most cost/time effective". Unless you just want to raise crazy expensive, time/pen space hogging prissy game birds, because they are pretty, or you think they taste better. Then you should do that. There is nothing wrong with paying 2-3times the cost/time/pen space for exotic quail if that's what you want.
The largest bird doesn't matter, because an ostrich is the largest bird in the world, but you can raise a few times it's body weight in coturnix quail, for a fraction of the time/price/pen space.