Which is best css transition vs request keyframe?

For better performance and quality? Which one can use to create plugin?
Requestkeyframe or css transition?

If css transition? by linking anim.css with all easing effect such as easeIn, easeOut and so on.
If Requestkeyframe? need to add easing effect using function as shown below.
easeInCubic:function(x,t,b,c,d){
returnc*(t/=d)tt+b;
}

suggest me… which one i choose???