I would go with the
ebb and flow if you have an intermediate timer so you can water correctly. And I would use the drip from the top if you use one of those cheep timers. The ebb and flow gardens work best when the water rises to the correct height and immediately drains back to the tank and then repeats every 20 or 30 minutes. You set how many minutes it takes to reach the height you want and you don't have to use an over flow pipe. Ron