Namaste
Why do you feel monotheism is best? Why is the Abrahamic model of monotheism so revered and touted as the best form of worship?
Well it comes down to logic, if something is more basic and works just as well then that is more likely and logical. If one God is capable of everything, multiple Gods are unnecessary. Though, many polytheistic beliefs split up things between Gods, making them Gods of something. However, one God is more basic.
Sadly, using this argument, no god is even more basic and everything can still be explained (sometimes better) without one.