Hi what sound signature and music preferences do u have? And budget?
IMHO the TFZ No. 3 has excellent quality and quantity of bass and is very non fatiguing to listen to.
But the bass is just a level short of basshead levels so i personally feel some people make not like it or it may not be suitable for some music genres like classical music. If u like bass driven music like EDM this is superb. It won't beat some multi BA iems in terms of details and clarity but for a single DD IEM, these are very good IMHO.
What multi BA do you mean?
Do you have any basshead rec up to 1000 USD?