The Acer Iconia X12 is the smaller model, sporting a 12.6-inch AMOLED display that has a 60Hz refresh rate, a 16:10 aspect ratio, 400 nits of peak brightness, and a 2.5K resolution (2560 x 1600p).
As the name suggests, the Iconia A14 sports a tall 14-inch IPS LCD panel with a FHD resolution, a 16:10 aspect ratio, and the ZeroFrame design. Acer offers this large display for daily use in mind.