Best?
Carbon, don't think there is a "best", only what one prefers. I prefer Winchester simply because I started with them years ago and have found no reason to change. I've used a few Remingtons, Federals, and just a few CCI's. Personally, for my type of casual target shooting, I can't tell any diff.
Same with powders, only there is far more variety to choose from. I load 38's and 45acp. I like Winchester 231, Bullseye, Clays. All seem about the same to me. From reading on this group it seems many prefer Unique. Pick one that a good reloading manual recommends and you won't go wrong.