For years I used CCIs for rifle because about half of what I shoot is in front of floating firing pins. I still use my current stash of them, but due to some light strikes with a 30/30, I'll probably use Winchester next.
I've always used Winchesters for handguns and shotguns. They have a medium hardness, and usually fall in the middle to high end as far as brisance or power. The other deciding factor is that for some reason, in my area, Federal and particularly Remington primers seem to run about $1-3 more per 1000 than Winchesters.