Although both of these types are found commonly among leaders, in reality, neither of the typical ENTP and INTJ is a good leader.

ENTJ, INFJ, ENFJ can be good leaders but in fact, they also need to balance themselves in their weaknesses and should not be their typical selves.

INTJ and ENTP are opposite to each other in terms of cognitive functions. You might see a lot of INTJs almost resembling ENTPs in terms of dark humor and crude jokes when they feel comfortable and free in their association. I am not sure if a depressed ENTP can pull off their shadow INTJ behavior (using shadow functions) but without losing control and without making an impulsive decision, if once in a while INTJs can practice being spontaneous, flexible, and witty like their ENTP counterparts they will appear a bit more people-friendly.

INTJs have some of the best qualities of being a leader due to their big-picture ambitions, strategic planning, and tenacity. But they have personal roadblocks which they must overcome to become a leader.

1. They must accept that a leader does not need to know everything. Because INTJs are highly competitive people, they have a lot of insecurities too. They have an extreme standard for themselves and others. They think they must be an expert in almost everything to be eligible to tell others what they should do. This is the same reason why INTJs hate most authoritative figures. After all, deep down they think most authorities are “idiots” because they have not earned their positions with expertise. This is also the same reason why most INTJs avoid seeking leadership positions because (although they already learn things fast and know better than most people) they think they have not reached that highest hypothetical level yet.
2. INTJs must learn how to smoothly delegate tasks without appearing intimidating but they don’t do it for the above reasons mentioned in point 1. Leaders need to understand the big picture, better if they understand the fundamentals and they need to learn how to optimize things– INTJs already possess such qualities but telling others what to do is also part of that task. INTJs who do a lot themselves including worrying for the companies’ future soon burn themselves out and act almost like unhealthy ESFP with abnormally high tertiary Fi and Inferior Se. A good example is Elon Musk himself with his recent erratic twitter behavior and burnout. He has been putting in an excessive amount of long hours for a very long time. Even if you have a “superhuman” drive and passion, you are going to have burnouts if you don’t balance tasks.
3. INTJs need to have flexibility and contingency plans as well. The majority of the time INTJs know what works in the long run, they go after it and accomplish the result. But everything doesn’t need to always go according to their impeccable plans. So a really good planner has flexibility, adaptation, acceptance of possible failure, and several contingency plans at hand.
4. INTJs should learn to take a calculative risk based on their instinctual Ni. Despite not having any statistical data of success, if their gut feeling says something might work, they should not hesitate to go for it, while already accepting failure as one of the outcomes. INTJs are good at minimizing risks but sometimes calculative risks pay off in life. BTW fear of failure is the number 1 reason why most people do not take risks.

A balanced INTJ with some balancing good traits of an INFJ and/or ENTJ has the potential to be great leaders. They need to develop their Te in terms of productivity (like an ENTJ) and positivity (like Fe from INFJs) while they already have the most powerful leadership tool Ni (perspective/vision) as a talent function.

An ENTP already possesses the qualities of a charismatic leader whom people might adore. They are spontaneous, flexible, and innovative. They are also confident and usually are not afraid to take risks. ENTPs are also quick.

But I have observed among ENTPs and ENFPs that a lot of them are prone to change plans very frequently and are allergic to structures/deadlines. Finishing a project is not an ENTPs forte. They are better at starting many things at once. So my advice to an ENTP to become a good leader are-

1. Come up with a hierarchical plan which has room for improvements along the way but does not change very often as a whole. You have to be like your INTJ counterpart a little bit in this case. If sticking to a plan is not your forte, find employees or people who can do that for you. You can hire an INTJ as a manager and ISTJs as a team members. These two types are just examples of people as employees but it entirely depends on the position or tasks which have a potential for different people.
2. ENTPs tend to make crude jokes which sometimes do not go very well with others. Some might get hurt and take it against you later, find it inappropriate, while others might find ENTPs constant argument and debate as shallow and annoying. ENTPs should watch out for different people’s sensitivity and think deeply before speaking. They like to make people laugh and they enjoy arguments for learning and bouncing ideas off of people- but other people might not understand ENTPs harmless intention. Most people are sensory and do not read people’s intentions.
3. I know everything in your book is fast and furious. But most things take time to develop, so does a logical deduction. So do not jump to conclusions too often. Do more research and find more evidence to form logical patterns before reaching a point.

The bottom line is, all types must be a bit well-rounded to become a leader. But despite having great qualities an average INTJs need to pass more personal hurdles than an average ENTP. But once they do the INTJ is the best choice. But in general, ENTPs have better potential in being leaders.