I've had both the UM3X and W4R and both coupled with silver dragon cable as well. IMO, both IEMs are quite different in their sound signature. Same as you, I was coming from the TF10 previously. Upon the switch from TF10 to UM3X was a total change in sound signature. The TF10 does very well in the bass region and treble extension, however, with recessed mids. The UM3X is more of a mid-centric IEM with a bass boost. Bass quantity wise, the UM3X falls slightly short against the TF10 but both impact and body is still present. IMO, I prefer the bass on UM3X more as it is tighter and extends slightly deeper. The UM3X does extremely well with vocals and puts you right in front of the singer. Instrument separation is amazing. Best in it's class. However, the soundstage is constricted though and IMO, the treble lacks energy and does not seems to extend well enough. This is a huge contrast against the TF10. The UM3X does very well with rock music. The W4, on the other hand, is tuned more to "balanced". Nothing is overly emphasized on. The W4 does have a slight mid bass boost. Vocals on the W4 is extremely lush and smooth. Mids are very well positioned. Details and instrument separation is great. Though not as amazing as UM3X. Treble is more energized than the UM3X and is tuned to be extremely smooth and non fatiguing. Again, comparing to the TF10, the treble on TF10 sports a higher energy. Soundstage is very good on the W4. Bass wise, the W4 loses out to both TF10 and UM3X in terms of quantity. But it does extends deeper than both of them. The W4 is more to the warm side due to it's mid bass boost. The W4 will be more suited to genres such as classical, pop etc. IMO, both IEMs are great. It depends on your personal taste, preferences and music collection.
