The LG gram is the clear test winner. The high-resolution WQXGA display offers great colours, high viewing angle stability and is sufficiently bright. However, the LG is slightly unstable in portrait mode. Only if your notebook does not have a USB-C port should you go for the Asus. You can connect it thanks to an adapter.

The 15.6-inch Zenscreen monitor uses a finely matted Full HD display and only one USB-C port. Thus, it works neither with DisplayPort nor HDMI adapters due to the lack of power supply. The colour gamut of the high-contrast IPS panel is quite small, and its display becomes darker and duller when viewed from the side...

As a second display with good portability and only one USB-C cable (incl. power supply) to connect easily, this model is quite appealing for enlarging the image display.