its 18v nominal, not 20v its marketing, it has the same 18650 cells in it as every other drill, however all 18v drills will be about 21v when fully charged
you needn't have worried about a 12v,a 12v top end drill today will be more powerful than your 10 year old one, as for sayin you needed something to save your hands from all that twisting. well you were given the answer..thats what an impact does
i had a friend down working with me on his camper van the other day, after a day of using an impact he asked me why the hell anyone would buy a drill these days? of course thats not an accurate assessment but it goes to show that form his experience and for his use the impact was the far better tool
i only use a drill for drilling small holes in wood or holes in metal. large holes impact, driving pretty much anything, impact, although for speed and less noise i do use the hydraulic impulse driver
for driving fasteners a drill is an inferior and outdated tool its been superseded