I've been switching between my 200s and my H3 for a while now, listening to:
"Carribean Queen" by billy Ocean
"Time" by Wiz Khalifa
"Anytime" by Brain McKnight
"Just in case" by Jaheim
Using my macbook pro. Not sure if it's a burn-in thing, but the H3's bass has kind of.. Mellowed out a bit. The 200s sound nice, as it always did, but I immediately notice the bass has a stronger presence, and the voices are more forward. The soundscape isn't as spacious as the H3, either, and little nuances are more noticeable on the H3. For example, when Wiz Khalifa exhales in "Time", you would have to be listening for it specifically to catch it. It's like with the 200s, a lot of things are fighting for your attention. The sound isn't as separated.
If you are looking for something that just sounds plain good, the 200s are okay. If you're looking for a more complete sound though, the H3 is better. By comparison, the sound coming from the 200s is a little narrow, though powerful. A little confined. That's not to say you can't hear a "soundstage" [Or "soundscape" as I like to call it] only that it's narrower. Again, both are pleasing to listen to, but the H3 paints a more spacious, better picture, and I find it more pleasing to continue using. I can immediately hear the difference between the two. The H3 sounds closer to what I wanted: to hear music like I was downstairs playing it from my home theater. The voices are still "forward", but the rest of the music is spacious.
The H3 can also handle higher amounts of bass rumble without driver rattle. Actually, it can handle higher volume overall. On my macbook, I would have to adjust my volume a little lower for the 200s, while with the H3, I can keep them at full volume. I mentioned 200s driver rattle before when I was playing the song "reunion" by the XX, and even made a video. This is not as apparent when I use the 200s with my iPhone, however, but if you like using your headphones with a computer and you are aware that the extra power can help drive the headphones better, it might be something to consider.
Actually, taking a closer look at it now, it sounded like the bass on the H3 took a backseat, but it now sounds... pretty balanced? Anyone else hearing this might telling you the bass got tamed or something to that effect. They both rumble all the same, but the H3 is a little less loud. It's like the 200s take the extra power and make a already somewhat jumbled soundscape a little more louder, and the H3 takes it and makes an already spacious soundscape more spacious. When something strikes, you hear it travel, and you get a better sense of space. Voices are also smoother. It sounds so much more different from what i was hearing with the 200s for about a year now.
The only other person I know with a H3 and a 100/200 is ericp10, so you could ask him to confirm any of this.
EDIT: I did some additional listening with my H3 using my iPhone and macbook, and it's not a burn-in thing like I assumed in my first sentence. The whole sound is not as a hefty as from the iPhone, which is unexpected considering what happens with the 200s, but other things stand out. It sounds similar on the iPhone if I adjust the volume, but not quite the same. The sound has this heft to it, compared to the macbook.
Edited by BlinkST - 2/23/14 at 11:35am