Screen size, resolution and quality are some of the most important features to consider when choosing a smartphone.
Vivo Y91C's 6.22" IPS LCD is slightly larger (0.12" ) than the Oppo A1k's 6.1" IPS screen.
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).
Vivo Y91C LCD covers 83% of its surface which is only slightly higher then Oppo A1k's 80%.
Screen size is only one side of the story, resolution is as important in most cases.
Oppo A1k's 282ppi pixel density is only slightly higher (12ppi ) than the Vivo Y91C's 270ppi pixel density.