Below is a picture of my (manly) cordless tools, just for size comparison, along with batteries. The tools are marketed towards professionals but my usage is simple home use in an apartment.
The batteries on the top row is of the same capacity but the newer model is smaller, lighter and can provide more current (got the older one for free). With the newer model much more care has been taken to give better cooling, so they can perform better in high drain situations, and some of the newer cordless devices needs the new batteries to perform maximally (current demand). Improved cooling is useful to extend battery lifetime during charging, especially if one use some kind of "fast-charging".
The rotary hammer drill at top have a drill-only mode but it's not what I'm reaching for when drilling a small hole. The drill/driver at bottom right is mostly used for drilling while the impact driver on bottom left is what I reach for when screws and nuts are involved.
They all have soft-start, which is quite handy for an amateur like me. Both the rotary hammer drill and the drill/driver are powerful and do have kickback-control as a required safety feature for me.
As
@Alex2507 wrote above, an impact driver is preferred by professional due to weight/size compared to a drill, which makes totally sense if you use the tool all day long.
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