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At the beginning of the game, you always lack knowledge (since spells generally deal the same amount of damage).
Closer to the end of the game, you need decent spellcasting, because you have a lot of knowledge, but the spells are weak (unless it's a fast-paced game, of course).
It also depends on the race – for Necromancers, knowledge is more important, but towards the end of the game, you have plenty of it anyway.
For Mages, only spellcasting matters, because they have 100,500 mana and can't really cast anything useful.
For Dark Elves, knowledge is important – enhanced spells consume everything.
For Knights – probably knowledge, since mass spells of light consume a lot.
For Demons – it's also difficult, probably both, because they can normally acquire spellcasting, but the spells still remain weak, and they also run out quickly.
For Dwarves – knowledge, the power of spells is not needed at all.
For Elves – spellcasting, towards the end of the game, you may have a lot of knowledge.
For Orcs – it doesn't matter, there's an infinite amount of both. Although, knowledge might be a limiting factor...
In my opinion, both are useful, just like attack and defense; it just depends on who you're playing as and what situation you find yourself in during the game.
It also depends on the map – size, number of upgrade locations, the ability to level up the hero, the length of the playthrough, etc.
Closer to the end of the game, you need decent spellcasting, because you have a lot of knowledge, but the spells are weak (unless it's a fast-paced game, of course).
It also depends on the race – for Necromancers, knowledge is more important, but towards the end of the game, you have plenty of it anyway.
For Mages, only spellcasting matters, because they have 100,500 mana and can't really cast anything useful.
For Dark Elves, knowledge is important – enhanced spells consume everything.
For Knights – probably knowledge, since mass spells of light consume a lot.
For Demons – it's also difficult, probably both, because they can normally acquire spellcasting, but the spells still remain weak, and they also run out quickly.
For Dwarves – knowledge, the power of spells is not needed at all.
For Elves – spellcasting, towards the end of the game, you may have a lot of knowledge.
For Orcs – it doesn't matter, there's an infinite amount of both. Although, knowledge might be a limiting factor...
In my opinion, both are useful, just like attack and defense; it just depends on who you're playing as and what situation you find yourself in during the game.
It also depends on the map – size, number of upgrade locations, the ability to level up the hero, the length of the playthrough, etc.
Whatever
