KNOWLEDGE! Why bother with strength? And if you're also a warrior, even more so – why bother? Strength hardly ever saves you. Knowledge is a different story. You boost your knowledge, acquire experts, and then go into battle!
Posts from Knowledge or strength?
It's good when both are well-developed. There's nothing to argue about here.
Yes, it's good to use powerful magic to eliminate enemies, but where do you get the mana? I personally play as Barbarians and prefer to develop knowledge a little more. Because I really like learning spells in enemy castles and using "Dimensional Door" and "Portal to Town." And that requires a lot of mana.
There's also a trick in that some spells don't benefit from high strength, for example, Haste or Slow, while others directly depend on strength - Explosion, Ice Bolt, etc. This should also be taken into account when choosing. It's also worth considering what you will use in the decisive battle - offensive spells or support spells (in this case, by offensive spells I mean spells that deal damage to the enemy - Explosion, Lightning, etc., and by support spells - Slow or Haste, etc.).
In general, the argument again depends on the circumstances. In principle, as with most arguments on the forum.
Added 1 minute ago
In a way, I level up strength and knowledge equally.
(Василь Симоненко. Люди – прекрасні)