Gee, that's a hard one. I'd say that if we're just talking bass, out of the pairs I've owned, I like the Moondrop Variations the most. They have bass quantity, and sufficiently detailed enough.

Close second, to me, is the 64 Audio Duo, which has absurd bass quantity (my smallest bass shelf added, in any device), but not as detailed as the Variations. It's a pleasing bass, for sure, but the rest of the FR is not very likeable without messing with EQ, and is pretty costly (would never buy at full price).