Which faction do you like the most in Heroes of Might and Magic IV?

So, you can build Crusaders on the 3rd day.

I agree, but this is unlikely in a champion game. Although the opponent will also have corresponding problems.

At the beginning of the second week, we buy a lord and level up his nobility to level 2.

This is an obvious and necessary tactic, but it is not only used by Life.

After that, he rests. The growth rate of Crusaders is 7 per week (I'm talking about the mod).

It's good that you specified that this is a mod. In a normal game, there will be 5.5.
Agree, by the time you (not in the mod) have 60 Crusaders, there will be even more vampires. And they will destroy the noble warriors without losses. When you need level 20 for a hero to raise vampires, Death has a very hard time (especially on huge or specific maps) (I'm saying that some developer loved Life and hated Necromancer with all his soul). But in a normal game, vampires start multiplying somewhere around level 10. And then either a great rush (it's nice to quickly and beautifully defeat your sworn enemy), or, in the case of Life, surrender.

Life is strong with a General.

I personally like this hero class. But Tactics can be developed not only by Life. Death, having reached level 5 Necromancy, can quite start leveling up the Death Knight. I think it's not worth reminding you what the already decent stack of vampires turns into. In general, Tactics is the most versatile and useful branch.

Even if you get the wrong amulet, it can help against neutrals.
(For example, Black Dragons guard a super artifact. And instead of an Order amulet, you get a Chaos one. So you can take the artifact).

An undeniable plus, but not decisive.

Life builds quickly and does not require a lot of money.

Have you summed up the costs of buildings in terms of money and resources? Have you compared it with other races? Life didn't seem very cheap to me. As an illustration, I will give an example of buildings for the creatures we discussed earlier:
pikemen + order of paladins + crusaders + angels + seminary + abbey = 33000 + 36 wood + 48 ore + 17 crystal + 14 mercury
hellhounds + vampires + chaos wing + devils + tower of darkness =
26.750 + 22 wood + 10 ore + 22 sulfur + 8 crystal + 12 mercury

Show me where Life is cheaper, it's more expensive.

And to successfully counter mages, you just need to gather an army in a shorter time and go to attack the mages in the 2nd or 3rd week, before they learn powerful spells (I'm talking about small maps).

And who is arguing, build Crusaders, accumulate, and go rush, otherwise it will be worse. But only if you don't get an Order amulet, Djinns can ruin everything.
Ah, it was nice to play the campaign for Lysandra with full leveling and all the necessary spells. I defeated everyone without an army.