I recommend that you read the opposed stat vs. Single stat thread.
The problem with opposed stats is that often times the variables are not really opposite. Single stats basically accomplish the same thing (if you raise one stat, you can’t raise another) , but they are less negatively received.
As for what makes a good leader, charisma/ intimidation is the most important skill to make people trust/ fear and follow you. However, if I have advisors/ ghost writers or a figure head, I could simply be the brains behind the operations and not need people skills. Are we going to have advisors?
A leader needs defense or offense skills to prevent others from taking / using their country or products. Those skills could include strong military skills to kill internal and external opposition, people skills that include other countries protecting you in exchange for your oil or academic worth or other goods.
You should think about real life leaders and what makes them good or bad.