They are going for different things, both for me great to listen with, like you say perhaps library based.The bird is indeed a top IEM and deserving of all the hype it gets. For me I would probably take EXT or XE6 over Traillii...but that's it and only for reasons of music library & personal timbral preferences.
My problem is my library is so broad that I can not really think that way. Traillii is a great all rounder, as is I am finding XE6, still very different to me in the listening where Traillii is more serious and XE6 is more fun. A question of balance both are in fact fun to me and also very capable with imaging and detail.
Perhaps like this for me;
Traillii - Imaging and Detail followed by fun.
XE6 - Fun followed by Imaging and Detail.
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