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My favorite here is the Necromancer, as I love elemental magic, and dark magic isn't bad either. It's a shame there's no Archmage in the game.
Second place in terms of preference is shared by the Tower and the Minotaur. The Tower can quite well replace the Necromancer's game-simplifying spells, plus it quickly strengthens the party, and it was also the first class I used to beat the game.
And I like the Minotaur because its main weapon is a two-handed axe, which I liked back in Might and Magic 7, plus it's a good warrior, and it was the second class I used to beat Might and Magic 8.
Then come the Troll and the Vampire. The Troll has the advantage that all the clothes look good on it. And the Vampire would probably be higher on the list if it had at least one attractive face.
The Cleric is, of course, the best support, but I don't like holier-than-thou types, so in the 8th part, I only had him in my party when I was playing as a Cleric, and even then, it was just me. I never helped the Clerics in their war against the Necromancers in the storyline (only once to see what I had to do).
I don't like Dragons; they're overpowered. Plus, you can't equip them with anything, and that's one of the interesting aspects of Might and Magic 6-8. But still, in the first 5-7 times I played the game, he was in my team, and sometimes even in duplicate. Now I never take him.
But with the Knight, it's complicated. It seems like the most ordinary class. The clothes look the worst on him. But you can create many different variations from him. He's the most useful of the fighters on the "good" side of the game. There are many artifacts that, although different classes can wear them, they ultimately only suit him, but at the same time, he's not without exclusive items. Of course, he's completely devoid of magic, but firstly, this doesn't waste extra points, and secondly, for a fighter, it's better to strike at the head in battle than to cast some spell.
Right now, I'm playing the game with only a Knight, and I'm playing it slowly, playing at best for an hour a day. Maybe something will come of it in the end.