The higher resolutions of the hero 3 black aren’t worth the extra cash it costs IMO.
The best setting I’ve found is the 1080 or 760 ones and these are probably both on the silver hero 3 as well as hero 3+
I bought. Black but before I had any understanding of the resolution differences. If I bought one now, I’d be buying a silver.
If I were you, I’d go for the silver hero+ as it will have all the resolution you need and a better battery life etc.
Google Abe Kislevitz for an understanding on go pro resolutions. He did the Hero go pro introduction video shoot a few years ago and there are a few pages on his site that are very helpful.
Whichever go pro you get, budget for spare batteries. The cheap ones off Amazon are perfectly good for much less than the go pro genuine article in my experience.