I think that when we see Standard vs Micro we should not consider runtime speed (that should be nearly the same in both cases), but development speed.
If you are going to create a tiny app with low functionalities and etc, then you should choose Micro because it helps you with this environment. The same goes for diferent projects sizes and Standard applications.
If the same app is developed in both types, the performance will be nearly the same, after all both run the same core in the end.