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The largest difference is that code requires a wired smoke alarm outside all sleeping areas, one in every sleeping room and one on each floor. If you are adding a smoke alarm and there are smoke alarms in all areas that are required that are wired than there is not a lot of difference.
They would be just as reliable as long as the batteries are updated. One small advantage of only battery powered is that if one had low batteries then that is the only one that will beep. Hardwired they all beep and you pretty much have to replace all of the batteries. Overall there is not any difference in function.
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