The ZST colorfuls are in my opinion the best you're going to get out of the top most liked in this thread. I have not tried the ZS3 yet, but I believe those are a more bass heavy sound. The ZST colorfuls are wonderful with a soundstage that is unbelievable. Pearl Jam - Soon Forget is quite possibly one of the best experiences I've ever had with music. I admittedly had imbibed in a small amount of the devil's lettuce before hand, but wow. Close your eyes, you can see a guy playing a ukeule in front of you, his head to maybe 3 degrees right. You can tell exactly which way his head is moving when he's singing, you can tell when he puts his head down and sings, and you can tell exactly which way the ukeule is positioned. It truly is amazing and I get that from no other KZ, or Tennmak. I get that it's a binaural recording, but it just blows my mind. Colorfuls ARE tuned slightly different than the OG ZST's.