"Leon" wrote in message
Keep in mind that a 12 volt impact driver will beat the pants off of a 24
volt driver/drill when it comes to sinking screws. I finally went to 12
volt 2 years ago after using 9.6 volt since the early 90's. I prefer a
drill that can be used all day long and not wear me out.

12V is plenty for what most of us do. I have no use for the 18V and larger.
Love my Panasonic 15.6V as it handles better than my old cheap 14.4V.
Voltage roughly translates to power, but other factors come in play for a
good tool. How smooth it is when you pull the trigger? Is the chuck easy
to lock? Does it keep the speed constant? Does it feel good in your hands?