Regargin mobile games I saw that most of the time eyes are textures, so the blink is an animation sequence ( eye open, eye mid closed, eye closed, eye mid open, eye open again ) rather then being controlled by joints or morph target.
Doesn’t really matter, because at the end of the day it should be skinned to the skeletal hierarchy in order to rotate around and move accordingly to the head movement.
Texture animation will do the trick and it’s quicker to do…you can animate the pupil if you want with morphs, but because it’s rather small I suggest using textures.
3.Tech is always evolving and the specifications for mobile games right now are different, so I will say that you can choose between using joints for eye movement rathern then morph targets ( more expensive then joint driven animation ). I use morph targets everywhere ( especially for facial animation ) and they work pretty well and performance are always good, so it’s up to you really which way you want to use to animate facial expressions/blink and so on