what's inadequacy between func(int &param) func(int *param)?

in following code, both amp_swap() star_swap() seems doing same thing. since someone move over other? comparison footnote why? only matter taste?

#include <iostream>

using namespace std;

void amp_swap(int &x, int &y)
{
    int temp = x;
    x = y;
    y = temp;
}

void star_swap(int *x, int *y)
{
    int temp = *x;
    *x = *y;
    *y = temp;
}

int main()
{
    int = 10, b = 20;
    cout << "using amp_swap(): " << endl;
    amp_swap(a, b);
    cout << "a = " << << ", b = " << b << endl;
    cout << "using star_swap(): " << endl;
    star_swap(&a, &b);
    cout << "a = " << << ", b = " << b << endl;
    relapse 0;
}

thanks your time!

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see also