Which method is better to initialize a vector

Please tell me which method would be better in this case, I want to use std::find later for the vectors. Vectors will include all times a tiny dataset. Thank you.

int main()
{   
    // method1
    std::vector<int> v1 = {1,2,3,4,5};
    bool cond;
    if (cond)
    {
        // find something in v1
    }
    else
    {
        v1 = {1,2,3};
        // find something in v1 with new values
    }
    
    // method2
    std::vector<int> v1 = {1,2,3,4,5};
    bool cond;
    if (cond)
    {
        // find something in v1
    }
    else
    {
        std::vector<int> v2 = {1,2,3};
        // find something in v2
    }
    return 0;
}