who is the best combination of technology?

The one that wins the game.

This is a 4x strategy game, so there are different ways to win. That means, depending on which type of victory you are going for, different tech combos work better. Not to mention the fact that personal preferences play a roll in how you best play the game, so that effects what each individual person would view as the best combination.

In other words, there is no best combination.

go for political victory its the easiest just research all the diplomacy techs and it will make it even easier