random_device vs default_random_engine

#include <vector>
#include <random>

using namespace std;

int main()
{
    vector<int> coll{1, 2, 3, 4};
    shuffle(coll.begin(), coll.end(), random_device{});

    default_random_engine dre{random_device{}()};
    shuffle(coll.begin(), coll.end(), dre);
}

Question 1: What's the difference between

shuffle(coll.begin(), coll.end(), random_device{});

and

shuffle(coll.begin(), coll.end(), dre);?

Question 2: Which is better?