Alex, sweet tea is a saturated solution. You can't get that much sugar to dissolve in it cold. Whether its "better" is a matter of taste. I prefer my tea unsweetened. And hot.
Americans brew tea to make it hot. Then they put ice in it to make it cold. They put sugar in it to make it sweet. And lemon to make it sour. But the British put milk in it to make it completely un-tea-like! Then there's chai. You could take the tea completely out of chai and no one would know the difference.
Americans brew tea to make it hot. Then they put ice in it to make it cold. They put sugar in it to make it sweet. And lemon to make it sour. But the British put milk in it to make it completely un-tea-like! Then there's chai. You could take the tea completely out of chai and no one would know the difference.