Well usually they take preference out of it. So, if true, a bigger stage would be deemed as better, if it is clearer Woo would state that as better, the separation, etc. Until I find my new portable that can match with my TC100, I'll say the TG38S is better for outside. The bigger stage and airiness thin it out and I prefer the TG38S as it has the thickness to be absorbed/cancelled out by external noise. So, the bigger clearer sounding one is the choice at home. Preference and usage come into play. An analytical listen in a place with no external noise and the TC100 is a clear upgrade in technical ability, lower reach on the bass, bigger stage, more accurate in tone and positioning, mids aren't recessed and are cleaner, resolution and transparency are greater, more impact even if they are thinner and more separated down low. Yet the TG-38S is "better" for on the go.
Do you listen to the tc100 amped? Although I find the mid of the tc100 better than the 38s I don't feel the tc100 have better lower reach on the bass. However I listen unamped.