Furthermore the Asus has a nice solid amber LED when the monitor is in standby mode, rather than the distracting white LED that fades in and out on the Dell that some over-enthusiastic engineer at Dell added. (You can disable the power LED when the monitor is powered on for both the Asus and Dell). So, for the remainder of my review:
https://www.amazon.com/Dell-UltraSharp-U2515H-25-Inch-LED-Lit/dp/B00SPWPF1O