Heroes of sword or magic?

No matter how much I play Heroes, whether against the computer or with a friend, in all parts (well, maybe except for the 4th part, because in principle, it doesn't really matter who the hero is, since you can develop both a mage and a warrior in such a way that you won't be able to tell who is who at first glance), I'll say one thing - A WARRIOR IS STRONGER, because the bonuses to attack and defense that are given much more often and applied to the entire army cannot be compared with the meager bonus to strength or knowledge that mages have (this advantage is especially noticeable on small and medium-sized maps)! I want to add that I was annoyed by the constant increase in knowledge when playing as a Mage faction! I ask myself: WHY DO I NEED 20 OR MORE KNOWLEDGE, IF DURING A BATTLE I CAN ONLY CAST SPELLS 3-4 TIMES (exceptions are tedious battles with 6000 nagas in the Dragon campaign), I would understand if a large number of knowledge points gave me a chance to cast spells 2 times per battle! In general, I didn't understand the point of dividing into mages and warriors in parts 1-4, if a warrior could easily learn all the same spells + while also decently upgrading his army?