Welcome to the forum Tom!
As the guys have said, to my knowledge the R doesn?t really have more low down power as such, the extra grunt is really due to the shorter gearing, which you could easily do on the RR if you desired.
If you?re considering an R, it is worth bearing in mind that there is an all/new model due to be released in 2021.
The Gen 3 RR is a very versatile bike and does make for a proper road and track weapon.
However, having recently had an R on loan for a couple weeks, the R does have its advantages as a road bike. In my opinion the R is the better bike for slow speed use, as the handlebars give you loads of leverage, a better balance point at very slow speed and arguably better visibility over cars etc.
However, for me the biggest issue with the R is the total lack of wind protection, which in my experience gets frustrating when travelling at national speed limit speeds etc.
At higher speeds, the RR is the clear winner, as you have way more top end power and the aero benefit means in a straight line it isn?t even close. I also don?t think anything beats a sportbike in terms of front end confidence at high lean angles.
The whole S1000 range of bikes are fantastic machines. I think another test ride is in order to really get a feel for which particular model is the best fit for you [emoji846]
Best of luck with your test rides, and I hope you?re onboard your ideal S1000 in the near future [emoji41]