Hi there, this vs HZ Heart Mirror ? sorry if this comparison us irrelevant from price perspective. but i really wanna know

Sorry, I don't have the HZ Heart Mirror to compare.

its okay . thank you for your in depth review , really appreciate it

Wich one would you recommend as an upgrade for my Tin T2, the MS2 or the Titan S?

Hello.
It will depend on your sound preferences. In this review there is a comparison between the two IEMS.
For me, both are very good. In short, if you like a more analytical sound I recommend the MS2s. For a more musical sound, the Titan S.

Thanks.