There is nothing intrinsic to Christian theology that favors either form of government over the other, despite what many may claim of late (i.e., the last several centuries). Personally, I prefer a Republic. If God has other plans, so be it, as long as there is a Christian restoration.
I suggest you expand your horizons and look to what Natural Rights mankind has, and what system is best in recognizing them.
No Monarchy has ever been a friend to individual liberty, freedom of conscience, freedom of speech, or pretty much freedom of any type.
That is why to advocate Monarchy is to be a servile anti-American boot licker.