Screen size, resolution and quality are some of the most important features to consider when choosing a smartphone.
Sony Xperia XA1 Plus's 24 IPS and Sony Xperia XZ Premium Dual's IPS screen have exactly the same LCD size of 5.5" so we don't have a winner here.
Besides comparing the LCD sizes, another specs that we find useful to compare is the ratio of screen area to total surface area of the phone (screen area/total surface area).
Sony Xperia XA1 Plus's 5.5" screen covers 83.44% of its surface area, on the other hand Sony Xperia XZ Premium Dual" display covers only 69.65% of its total surface.
Screen size is only one side of the story, resolution is as important in most cases.
Sony Xperia XZ Premium Dual's 801ppi pixel density is significantly higher (400ppi ) than the Sony Xperia XA1 Plus's 401ppi pixel density.