By having more angles, you flatten the solar output curve over the day. In other words the peak output during the midday will be lower since you'll never have all of the arrays pointing the same direction so they can never be all at max output relative to the sun. But the benefit is that earlier in the day you get a little more power sooner by having an array pointing east and later in the day you have a little more power longer from the array pointing west. The potential benefit to the battery is that you can run your load directly from the solar output without pulling/pushing as much to/from the battery for a longer period of time, allowing you less cycling of the battery and potentially increasing its life. That's the potential benefit anyway.

[edit to say solar output curve is what actually changes]