While I'm quite confident that I am an ILI, I'm unsure about my E-type. I don't really believe there is a 100% correlation between the two systems, meaning that ILIs are definitely fives or similar propositions.
So I wanted to ask the Enneagramm experts among you what the most important differences between 5w4 and 1w9 are. While I was looking for my type I concetrated on these two because I think they are the most likely possibilities. At the first glance, the basic types 1 and 5 seem to be very different. But if you also consider the wings, they share some traits such as subdued emotions and general independence.
I first thought 5 would be definitely right, because one of the main issues is a detached lifestyle and clear loner tendencies. That's something I see in my life, too. The pursuit of knowledge seems also right. But on the other side, I'm also a perfectionist in many situations, I stick to the rules and I try to do everything the "right way". I often think quite practical, which is not necessarily typical for fives and change can be somewhat uncomfortable for me. 1w9 could explain my "rational" (in socionics terms) tendencies.
EDIT: Another point which leads me to 5w4 would be the artistic trait of the wing.