which one is better? and if you could specifically answer these questions i would appreciate it: 1) which one takes up more batter? 2) on BW, i heard you can set it to only update 15 minutes of so, whereas WaT widget constantly updates. does this mean the clock on BW will only update every 15 min? 3) can WaT widget do anything that BW cant? 4) do one or both of them have an option where you can set your background to be the actual weather?