growing a large vector iteratively

hi,

in the code below, i compare two options i) and ii). i have a feeling
we should use i) if A's size is a smaller than some threshold ii)
otherwise
1-is this correct?
2-what would that threshold be?
3-more precisely, in defining "A's size" i'm not sure if both member
functions and member variables affect the memory needed to store/copy
an object or only the member variables).

i)
vector<A> v;
while(has_not_converged()){
 //some code that generates a temporary A a;
 v.push_back(a); //a has to be copied//every--time v.capacity() is
reached, reallocation is necessary.
};//typically converges after up to a large, but unknown, number of
loops, such as say 100, 1000

ii)
vector<A*> v;
while(has_not_converged()){
 //some code that generates A* a = new A();
 vector<A*> v.push_back(a);
};//typically converges after up to a large number, but unknown number
of loops, for example 100, 1000

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