I found TD-III a bit too bass heavy and definitely prefer the N3's. The N3's just seem a bit more musical, they have a terrific tone about them and each of the elements (bass, mids, treble) seem to complement one another so well. N3's have less bass but adequate to make any genre of music enjoyable. Where as TDIII makes hip hop/dance fun, but for slower and musical tracks the bass can be a bit tiring to listen too. TD-III mids are also quite forward which is not my preference but maybe for others. However, the TDIII are more comfortable than the N3's.
I personally wish they reproduced playaz N3. If they improved the following areas it would be the perfect IEM in my opinion:
- smaller and more comfortable housing
- Enhance build quality
- add mic for smartphone compatibility