i think that one of the reasons i shy away from the enneagram is that i tend to cycle through all those "feeling sets" over at least a few days, if not a much lesser timespan, and as such the enneagram seems strangely restricting to me. i suppose this sentiment in itself should lean me towards 9 or 7 - and towards choosing the type i feel like the most often - but i do not meld with any of the type descriptions well enough to feel secure about identifying myself in that way. the issue of quantity and quality also arises in my head - perhaps i feel like a 7 most often, but what if my deepest issues are really not 7ish? whereas with the MBTI, i feel that we are given more room for variability in feelings and behavior, but type portrays recurrent patterns of cognition.
of course, for those who match up well with the extant enneagram typings - and/or for those who tend to stay in a steady mode of Feeling- the enneagram may hold far more answers for the very same reason.