With cordless you really want to stick to a single battery type. This so you can swap them between the devices. Note, I wrote battery type, not brand as some brands have different models of batteries, usually based on voltage. As in, DeWalt 18v vs 20v. Other brands do this also, usually because the higher voltages provide more power for heavier-duty stuff.
1/2" is great if you only have one, but they are heavier. This gets tiring after a while if you're doing a lot of work. But for typical DIY it'd be fine.
Also note if you get into any close-quarters work (like between joists) it helps to have as short a distance on the unit as possible. Or have a right-angle drill instead. Otherwise you can't quite get in there with the drill AND the drill bit. They do sell shorter bits but then you can't drill through as much material. A right-angle drill lets you use normal length bits.
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