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5.56 is a lot cheaper than 308
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As a relative new-see to the ar world, I don't have a lot of definitive answers, but I do have theories:
1. Practice will make you a better shot and more comfortable with your rifle. Buy what you can practice with more often. Between your choice of calibers, I say, "the answer is 5.56".
2. "Don't sweat the details when making your first choice." Take advantage of the flexibility of the platform: I don't have any specific make/model recommendations, but if you have a solidly built lower, there's no reason you can't swap out uppers and change calibers to 7.62x39, 6.8, 6.5Grendel, etc very easily. You can do this also with the larger AR-10 platform, as well. The point is: you're not married to anything that you can't easily change with the AR platform. Buy a highly recommended make/model and you probably will be a happy gunner. Buy a troublemaker, and you can always swap out the problem child part (upper, optics, handguard, etc).
happy shooting.