I can give you a quick one on that. SWIII by a ways, if you happen to have one of the originals. There is some contention that the newer ones have changed somewhat. There is STILL is nothing currently in that >$200 --- <$250 price niche that comes close. Granted, I haven't heard everything, no one else has either I believe. The only problem is that the SWIII is NOT a relaxed listen as I have said from the Outset. Too much Audio information and it would be described as a fairly Bright signature over all. If you want to sit down and listen for 4-5 hours or so, It would be the Magaosi K3 over the SWIII.
It simply depends on if you want Clinical Precision with the Widest sound stage imaginable, or a Little Darker with Vocal Mids (particularly female) that are simply Stellar. Before you ask, Yes. The vocals on all the Magaosi simply slaughter most IEMs out there. It seems to be their "House signature" It is the Same for the K1 and little brother M3. I have all of the IEMs mentioned.
JMHO
TWIN