How to use conditional statement within child attribute of a Flutter Widget (Center Widget)

Question

So far whenever I needed to use a conditional statement within a Widget I have done the following (Using Center and Containers as simplified dummy examples):

Answer 1

Only if vibrating widget

if(bool = true) Container(

child: ....

),

OR

if(bool = true) Container(

child: ....

) else new Container(child: lalala),