Ambiguity while using recursive template function

[jellllly420]

I have read the chapter 2 of the tutorial and wonder now why the code below will not lead to ambiguity.

#include <iostream>
template<typename T0>
void printf1(T0 value) {
    std::cout << value << std::endl;
}

template<typename T, typename... Ts>
void printf1(T value, Ts... args) {
    std::cout << value << std::endl;
    printf1(args...);
}
int main() {
    printf1(1, 2, "123", 1.1);
    return 0;
}

Or when we pass only one parameter into printf1 like printf1(1.1);, how does the compiler decide which template function to use?
I myself would prefer the version below.

#include <iostream>

void printf1() {}

template<typename T, typename... Ts>
void printf1(T value, Ts... args) {
    std::cout << value << std::endl;
    printf1(args...);
}
int main() {
    printf1(1, 2, "123", 1.1);
    return 0;
}

I'm new to cpp programing so any help is apprecited.