I bought the 848 because I have always been faster on and enjoyed the less powerful sportbikes a little more. Having owned 160hp liter bikes, hyperbikes, etc. I have discovered I am not skilled enough nor have the temperance to handle a bike with the 1098's power. I am not even a match for the 848's prowess for speed so my advice is to ride both and go with what you are most comfortable with.
I sampled both before buying and was at greater ease with the 848's forgiveness. I also could get away with hamfisting the throttle a bit more on the 848 without worrying about the consequences. All of this at a cheaper cost of entry and insurance rates I could live with sealed the deal.
Try them both; they are both wonderful bikes. Most importantly, make sure you can adapt to the aggressive ergo's.
Good luck,
Del