If you had a country what democracy will it have and why?

The democracy I would select is the "Representative democracy".

This is because in this imaginary country of mine, I believe the population to be large and have many work to do apart from governing a country and run its daily tasks personally.

Because of this, representative democracy will work best and people will be able to send their representatives to the parliament / congress to represent their political and social views and govern and make decisions on behalf of them.