I own some IEM & TWS for far more than 10 years now, I usually kept them all if hey were not returned within 2 weeks.. these last 5 years, I was mostly playing with some :
-> Sony's IER-Z1R, IER-M9, XBA-N3, MH755
-> Sennheiser's IE900 IE600
-> Beyerdynamic's Xelento Gen 1
-> Vision Ears EXT
-> JVC's HA-FW1800
-> some chinese iems like Tangzu Zetian WU & Princess Chang Le, Kiwi Ears Quintet,
-> some other ...
-> and many TWS like B&0 E8v2, Apple Airpods Pro 2, Cambrige Melomania 1, JVC&Victor HA-FW1000T, Galaxy Buds Live & Buds2 pro, Sony FW-1000XM5, Technics AZ80, Jabra Elite 7 pro, Liberty 4, Sleep A10, .. and some others
What is strange, is that, after so many years and attempts, in 2023 my personal podium for most portable, comfortable and best sound quality IEM & TWS combo is on this picture...
1) The best sound quality is the IER-M9 with IER-Z1R silicon tips connected to a WM1A (Nayparm moded), but almost as good with the FIIO BTR7 (unfortunately too short battery playing time in LDAC mode for long 24 hours+ overseas trips).. if the IER-Z1R was some more comfortable in the ears, it would be on the podium instead the M9 for offering really convincing lows (for mid-high and high frequencies the M9 is for me an absolute reference, probably boring for many, but quite accurate for me with cymbals and other instruments)..
2) The XBA-N3, with 1000XM5 foam tips, is not so far the M9 for Sound Quality and it is quite convenient when plugged to the iFi Go Pod.. I really enjoy it a lot for office time... I would recommend any-time this, as a rather affordable, really fun with a very good sound quality portable combo... N3 are clearly a bit weaker than M9 for high frequencies (as if some details were missing).
3) The most convenient combo 24h/day 7days/week, with still a decent sound quality, is the 1000XM5 with some silicon Tips (I forgot from which brand I took these), though sound quality is rather significantly behind M9 and N3 set in BT LDAC mode !!!
With such decent ANC, I think I will use the 1000XM5 now for all my trips when planes, trains, metro and street are evolved (instead my 2 loved HA-FW1000T)..
NB : I usually use with all my IEM and TWS some PEQ (Android's PowerAmpEQ) with a rather similar frequency response target as RikudouGoku's target ... I would say at least a harman target with some ultra lows boost (20 to 60hz) and high frequencies boost (8kz to 12kz)