Any SQ difference between T10, S3, K3

[seamoon]

Any SQ difference between T10, S3, K3? I'll buy cheaper one if SQ is the same, that's why I asked.

[lebellium]

They are all based on DNSe 2.0 (native on the T10 and S3, via firmware upgrade on the K3).
T10 and S3's sound quality should be close but I've never really tested the S3 sound quality.
The T10 beats the K3.

I cannot recommend you a K3 as it is a very old model and even if you find one in second-hand, the battery will probably be in a poor state.