How to properly initialize the data members in C++11?

In C++11, we have two ways to initialize the data members of a class/struct as illustrated in the following examples:

struct A
{
    int n = 7;
};

struct B
{
    int n;

    B() : n(7) {}
};

Question 1:

Which way is better?

Question 2:

Is the traditional way (the latter) not encouraged from the view of a modern-C++-style checker?