I would say the benefit digital series of AOS is not really for temp setting... temp setting is done by the mixer of the shower set.. but the sensors in the tank that provides the hot water level, current temperature of the water details show on the display. So went you want to take a quick shower can know if there is enough hot water or not, when you just reach home you know after how long hot water is ready. Basically the ability to know your current hot water information...
The normal water tank, you will just on and wait for XX minutes and hope you have enough hot water to last.. maybe you don't need to turn on the heater as there's enough hot water remaining from previous shower but you'll never know.
In a way the digital display helps you save electricity in the long run. Of course there are other functions like timer, automatically on off, temperature setting so hot water don't get too hot which will reduce tank life & etc. Can read from AOS website.
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