What are the pros and cons of each approach?

[wennuan]

Excuse me,my English is poor.
Compare two kinds of class design.
1.

class A
{
public:
    //Ingnore other member and implement
    vector<A*> m_vSubA; 
};

2.

class B
{
public:
 //Ingnore other member and implement
};
vector<B*> m_vecB;

[MikeyBoy]

It's a question of using the right design for the right problem. Does it make sense conceptually for an object of type A to contain a collection of other objects of the same type? That will depend on what A actually represents, and what relationships between objects you want to model.