Big difference in "mood" between the two, if you haven't been there/done that. Kruger was set up for local families to go out to the park and hang out with the animals, which (except for spotted cats) all but jump in your lap. It's very do-it-yourself, relatively inexpensive (although they've discovered "tourists"). East Africa is still Great White Hunter territory - without a guide, the animals are spots in the distance, and boy do they get excited when you point things at them, even telephoto lenses.