I can't really provide concrete numbers, but there's quite the difference between sustained torque and impact torque.
Let's use my winch analogy again, adding that the axle be prevented from moving in reverse. An impact would be equivalent to tapping on the winch handle with a hammer, up to 2800 times per minute in the case of the aforementioned LI. More force imparted with each blow, but not constant. The drill would be more akin to using the winch handle, constant force and effort.
Was just on Youtube, got another comparison idea. Thanks Hydraulic Press channel, lol! Job at hand is squishing a metal sphere into a coin. Impact would be akin to flattening it out with a hammer, while the drill would be more along the lines of the press, constant application of force.
A few years back I was truly surprised while putting up my kids playset. At the time I only had a couple Ryobi cordless tools and was thoroughly unimpressed by the impact. Half a battery and a couple minutes to drive 10" timber lags. Had a pancake compressor as well, picked up a basic rattle gun(impact wrench, like the tire guys use) from harbor Fright. Worked better than the Ryobi, but I still spent more time waiting for the compressor to refill than I did putting in the lags. Decided to try the basic heavy duty corded drill I had picked up from HF in order to power the 24" long drill bit, spun those lags in so fast my buddy and I were blown away.
The above experience is part of why I was a cordless tool skeptic for a long time. I had a bit of remodeling to do and the batteries I had for the Ryobi stuff were kaput by then, so I splurged on a drill/driver set from DeWalt. Night and day difference between the Ryobi and the DeWalt. Got introduced to the Milwaukee 12v line at some point and bought into that heavily. Buddy liked the DeWalt set I'd put together in a rolling toolbox stack and offered to buy it off of me so I could fully switch over to Milwaukee.
If I get down to the shop today(yay pandemic and child care) I'll run a quick video demo with some 10" timber lags and can compare a "standard" drill vs impact. Can also toss my Surge in the mix.
PS Don't even get me started on those dang hitches!!! I've shinned the one on my SUV so many times my shin is starting to grow extra padding. It's like the last bruise solidified into callus