While hero attack is the most important hero attribute, hero Intel can benefit you much more in certain situations. Some units receive a large Intel bonus, while other units receive no bonus from higher Intel because their life is maxed already.
When attacking NPC's with warriors for much less losses put all you gear to Intel if you are using level 100 heroes. The reason being warriors benefit much more from all gear set to Intel than they do from all gear set to attack.
|Unit||Max Intel Bonus||Max Life|