Militia vs infantry

Infantry has 6 defence and costs 70.
Militia has 4 defence and costs 30.
So for the same price militia has 55,(5)% more defence. So is it better? Or maybe less defence but in "bigger chunks" works better in battles?

Also fortifications and general add some bonuses, right? And this is a bonus for each troop? If so, that means it's better to have more weaker troops, because you get more bonus. So militia OP????

At early game it would probably be worth it to build militia for defence but if u reach the point where u have enough money to auto produce infantry instead of militia id say to build inf

Reinforcements are limited like the money. So for example, when you have $350, and 6 reinforcements, you can either build 6 militias or 5 infantries. 5 infantries will be the better choice.

And when you play in Europe, you will usually have more money than reinforcements.

But even when you have lesser amount of money, militia are still not very good because of their low range. You need to constantly expand or fight your opponents, and you will lose a game if most of your units are almost stationary.

Guerilla Warfare makes their range a bit bigger but even that's lower than the default Infantry's movement range.