ENTPs and ENFPs are much like each other. They are both 
- intuitive,
- spontaneous,
- flexible,
- impulsive,
- fun-loving,
- creative,
- imaginative,
- outgoing,
- easy-going,
- active,
- energetic.
Sociability
Both the ENTP and the ENFP are outgoing types. That said, being known as the most introverted extrovert (or extravert, if you prefer another spelling), the ENTP is more introverted than the ENFP and all other extraverted types.
The ENFP, on the other hand, is extremely social; they are always surrounded by people, which may make a personal relationship with them a frustrating experience.
So here you have it: the ENFP is social without any reservations while the ENTP enjoys the company of others but makes it a point to spend regular time alone.
Social skills
When it comes to social skills, ENFPs do it a little better than ENTPs. Naturally warm ENFPs are generally more compassionate than ENTPs. They take more interest in other people and are able to understand them better.
ENTPs are more assertive and less self-aware than ENFPs. In addition, they have a tendency to disappear from time to time, which isn’t a characteristic other people typically enjoy.
ENTPs are more logical, more confident and less sensitive to criticism than ENFPs. Just like ENTJs, they speak their mind without worrying about hurting someone’s feelings. Unlike people-pleasers ENFPs, they can handle criticism very well and aren’t overly sensitive to rejection.
To sum up, ENFPs are naturally sensitive and diplomatic while ENTPs are more confrontational and blunt.
Life experiences vs. work commitments
Both the ENTP and the ENFP want to experience life to the fullest. They want to love what they are doing, and they want to be excited every single waking moment. This, of course, doesn’t work very well because to be able to enjoy the finest things in life, you need to find a way to support that type of lifestyle. And that’s where the ENTP does better than the ENFP.
The ENTP is a natural entrepreneur while the ENFP tend to waste time and procrastinate. Of course we all know that ENTPs have their weaknesses too. For example, they aren’t particularly patient and they have a lot of unfinished projects, but at the end of the day, they do manage to accomplish something while ENFPs… not so much.
When it comes to work and career, ENTPs are more similar to ENTJs and are naturally ambitious. ENFPs, on the other hand, are so consumed by socializing that they have little time for anything else.
Decision-making
One area where these two types differ the most is decision-making. Here is how the ENTP makes decisions:
- generate a list of criteria to look out for
- generate an enormous list of possible options / solutions
- check each option against the criteria to see which option meets all or most of the criteria
- done!
Compare that to the ENFP’s decision-making style:
- focus on the big picture
- glance over important details
- evaluate options based on feelings and personal values
- consider the impact his or her choices make on other people
- hesitate…
Sensitivity
ENFPs are much more sensitive than ENTPs. ENFPs tend to take things personally and worry a lot about how their words and behavior affect others. ENFPs constantly get their feelings hurt and obsess over others’ feelings.
ENTPs, on the other hand, are assertive, self-sufficient and a little blunt. They don’t obsess over how they come across and do what they need to do as long as they believe they are right.
To sum up, the two types are very similar but they have a lot of important differences as well. The ENTP is a unique type that has both ENFP and ENTJ personality traits that make people with this personality type both achievers and fun-lovers at the same time. ENFPs are social butterflies. They are consumed by their social interactions, which often gets in the way of achievement.
The ENTP Personality Profile
The ENFP Personality Profile
10 Ways ENFPs Annoy Others
16 Personalities
Personality Test (in case you are still doubting)