I've had the opportunity to compare a stock Bridgestone on my previous 2012 Triumph Street Triple and the stock Pirelli DRC on my new 2013 Triumph Street Triple R. Simple put, Pirelli DRC is so much better. They stick very well with no surprises in all conditions. Just give it a couple minutes to warm up, even cold they were better. The center in showing only a tiny bit of wear and little less on sides but to be fair I'm still finishing a careful break-in on this new bike at 1550kms.
Using the Bridgestone's, they were slippery scary. I once had to drop my foot to avoid a slow speed sudden slide out in a corner! I have had no experience with the Pirelli Brand but pleasantly surprised with its performance. Having only owned in past years other brands; Dunlop, Metzler and Bridgestone, I can say these are the best I have experienced. The DRC's have provided me with very high confidence both in cold dry and wet conditions. Very good in Canadian wet cold climates. They provide quick flick-able feel in corners with super grip. On the highway, very comfortable ride, they show excellent handling at higher speeds in spirited riding on standing water conditions, heavy showers, loose pavement, uneven or bumpy surfaces.
Highly recommend the Pirelli DRC and will buy the same again.