Personally, I find the Chu much more comfortable than the Aria and Starfield because they are smaller and won't put pressure on my ear. So it's completely subjective. And I think the price difference between these models is ridiculous. The Chu is just the Aria with less bass, they may sound a little too bright for some, but on the other hand, the Aria sounds a bit dark and muddy. The Kato sounds a bit better (because of a smoother treble) but they are much more expensive. In the end, I sold all my Moondrops and left the Chu which I use with the EQ or with other ear tips.