Difference calling a function in DllMain by CreateThread or calling directly

What's the difference in calling a function in the following ways:

The first way to create a thread. Example:

DWORD WINAPI Metodo1(LPVOID)
{
      // Meu código aqui...
      return NULL;
}

int WINAPI DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpvReserved)
{
     switch(dwReason)
     {
     case DLL_PROCESS_ATTACH:
          CreateThread(NULL, NULL, &Metodo1, NULL, NULL, NULL);
          break;
     }
     return true;
}

Second way calling directly on Main. Example:

void Metodo2(void)
{
    // Meu código...
}

int WINAPI DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpvReserved)
{
     switch(dwReason)
     {
     case DLL_PROCESS_ATTACH:
        Metodo2();
        break;
     }
     return true;
}