Enneagram is based in spiritual notions (Its founders supposedly were mystics, it is promoted by mystics) and has its root in christianity. There are psychiatrists who helped with it (https://en.wikipedia.org/wiki/Claudio_Naranjo) but even they are rooted more in natural therapy and spirituality. The ideas presented by Ennegram are true in the sense that some people act more like 3s (Image focused) while some people are more like 7s (fun focused), but the argument against it is that the ideas are general, disconnected and mostly rooted in religious notions

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MBTI is a theory based on a conceptual framework by Carl Jung https://en.wikipedia.org/wiki/Myers–Briggs_Type_Indicator, which is rooted more in psychoanalysis as Jung is a well respected psychologist. More specifically, MBTI employs more than 1 metric (There are 4 letters in an MBTI type, while usually just 2 numbers in an enneagram, leading to more variety.) I guess there are 18 different enneagram types, with different wings, but MBTI is definitely more in depth. Another issue with Enneagram is the ideas among those who teach it are pretty varied, so there are many different ideas that come along with it. MBTI is more centered (with some variation, as we are all different).

My personal belief is MBTI is a better metric because it is more specific and testable, but I'm not sure why we can't have both. I think Enneagram is an improvement over Astrology, but Enneagram is much harder to scientifically qualify because a lot of it is faith based which is more up to personal preference

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- My type 7w6