I think it's no longer a choice between KZ ED9 or KZ ATE, but rather a must to get both of them
Got KZ ATE as well (both ED9 and ATE came from Zhengnan shop, he already has ED9 on Amazon US and soon should have ATE). While ED9 has a superior build (all metal, replaceable filters, solid build of inline remote) and ATE is more lightweight and cheaper plastic build, in terms of sound ED9 with brass filter is pure neutral tuned "gold" with a great extension at both ends, very spacious sound, and excellent retrieval of details; and ATE is really aiming to take a jab at IM50 with a balanced slightly warm sound, excellent bass details (ED9 with gold filter can't touch that), mids with plenty of clarity and details (though not exactly at ED9 level, but close), and nice treble sparkle (ED9 has a little more extension there). For now, I'm leaving all my final impressions until each IEM gets 50+ hrs of burn in. I like how ATE has two little weighted capsules to hold your wire down behind ears.