For a government ruled by man's law, then constitutional monarchy should be the best option, until the Messiah comes back.
Democracy (better called democrazy) if the most corrupt form of government ever existed on the face of earth.
Even more, the "beast" mentioned in the book of Revelation, is no more no less than a political, economic, social and religious system. The "beast" is so powerful because the whole world follows it as its flag to be saluted. People defend the "beast" with all their heart, for them is the greatest of the greatest. Any nation that decides to have a king, or is ruled by a dictator, the "beast" will consider it as "evil" and its worst enemy. And people will clap when the "beast" invades and destroys any other form of government that is not democratic.
Yes, the great political system before the coming of the Messiah is democracy. The other complement is the economic system, the current one we observe in the world. Same as well, societies of different countries actually are dressing the same, have the same social principles, but if a nation decides to have their own social rules, then the "beast" attacks again, and teach its followers that such a nation is "evil".
The religious system is slowly but surely taking control as well. There are thousands of religions, but the majority are unknown by the general population. And soon the different religions will end having a kind of agreement.
The "beast", admired by many, is the weapon of Satan, the deceiver. Religious people can't see it but have fell in the trap. Bible says, "get out of the beast", don't be part of it, but people has been blinded, they see in the "beast" attributes like freedom, peace, equality, progress, and more.
The political leaders are all corrupt and liars, but people pay no attention to that, after all "nobody is perfect".
OK, the "beast" is the winner... by now. Bible says the "beast" will fall, and here, right here is when people finally will open their eyes, and for many will be too late.
Ther is no indication at all that Jesus and the apostles supported the political system of their era, they lived without participating in favor or against the system. Jesus never told the soldier to quit his job otherwise no miracle will be performed for him. Jesus worked for the Kingdom of God, and I think that must be our duty as well.