I'm not sure what's the difference, here where I'm at Coke is a brand made by Coca Cola Bottlers. (Others are Sprite and Royal)
both are good,,electronic media use Coca cola for advertisement but coke is simple to write in search engines. I think both have good traffic you can use any one
Both are not good for health, weekly or 2 weekly it is ok. And i would like to take cocount water that's keeps me healthy.