Asus VP228N 21.5"
The VESA mount is a standard used by most manufacturers. A device that supports the VESA mount can be mounted on many different supports, from arms to wall mounts.
Asus VX278Q 27"
The bigger the screen size is, the better the user experience.
The device has a display with three full subpixels per pixel, resulting in a sharp and crisp picture. Pixels in some displays (like AMOLED) share one subpixel to preserve space. This can result in a less crisp, slightly blurred image.
1920 x 1080px
Dell UltraSharp UP3218K
7680 x 4320px
Uses LED backlighting, resulting in better image quality, more vibrant colors and richer blacks.
You can operate the device easily, by pressing the screen with your fingers.
A properly calibrated screen represents colors as they are and i.e. you can conduct a photo shoot while verifying your photos in real time. An internal sensor and/or colorimeter is usually included for trouble-free calibration.
With more USB ports, you are able to connect more devices.
The USB ports on the side are easier to access than those in the back and can be useful for plugging and unplugging devices quickly.
Asus ProArt PA27AQ 27"
Ethernet is a local area network technology.
The device can connect to WiFi.
802.11n is a wireless standard released in 2009. It has faster transfer rates and improved security compared to its predecessors - a, b and g.
A front camera, also called secondary camera, can be used for video chats/selfies.
With a search browser application you can surf the internet from your device.