Well said, but not the case for my experience. I find more problems with players and +R, even with bitsetting, mostly Panasonic and off brands. I also find lower prices on -R and a significant benefit in being able to get exacly the media code you want. Too many +R brands are hit or miss when it comes to the media codes.
That being said, I use both. There are great discs in both types. Occasionally I find a good deal on +R discs on sale. In the long run, both play just fine and both burn just fine. Difference are personal.