I felt the biggest relief when I found the profile of an ENFP. But that was coz at that point in my life, I *needed* it and was actively searching for who I was. So MBTI quenched a thirst that sorely needed quenching.
Enneagram took me a longer time to assimilate, but I've been more sure of my type there than I've ever been about my MBTI one (I'm xNFp...but that's about all I know). I knew I was a 4 the moment I came to terms with the bad rep the type seems to have
I admire 9s and it's been suggested many times I am one but no. Way too much drama and intensity for that, sorry
The thing I especially identified with however, was the description of a 4 sx-so.
I too appreciate the growing levels in the enneagram, but I also enjoy the functions as building blocks of your type in MBTI. I find that MBTI is stil more comfortable to me so I need to study enneagram more, but overall, MBTI feels more useful when dealing with other people, while enneagram digs deeper into understanding yourself. For that matter, MBTI was the perfect intro to personality types and enneagram the perfect follow up, in my case.
When it comes to really getting to know a person one on one though..enneagram is more instinctual than MBTI. Once I get talking to a person, you get to see their inner drives and motivations. It's nice to be able to put a type on that. And it is less clunky than MBTI. For instance, when I'm talking to someone whose an 8, even if I don't know it, I recognize them most of the time almost instantly. That aura, that smell is unmistakable no matter their MBTI type. The same goes for a fellow sx-dom. Otoh, if an INTJ is having a lazy day, I won't spot the intj in him instantly.
MBTI aims to tell what a persons preferred course of action is in just about any situation and to a lesser extent how he experiences the world. Enneagram is the the other way around.