I think the PFE's are superb IEMs and i especially enjoy the sound and comfort. The B2 i haven't tried yet... Heard great responses from both, but i only tried the PFE so it's difficult.. Both same price btw.
Thanks for the responses in advance!
I've never tried brainwavz, but the PFE 122's are not bad with D&B. I do listen to a bit of that n dubstep (never used them amped as my Fiio is stuck behind the radiator lol). To myself i find the bass reasonable. Very clear (And im just wearing them in), using the grey filter tips.
They give a good representation of the bass, but prefer my Sennheiser IE7's if you're a nutcase of a bass head. All that said, i would wholeheartedly recommend them. PFE's seem well built too. nice thick cable, superb fit (esp with comply tips included). PFE's for me (Though i cant directly compare)
Neither choice is good for a person who likes real sounding bass. Try a dynamic driver iem instead. Two excellent choices in that price range are the Monster Turbine Pro Gold and the Future Sonics Atrio. She'll be very happy with her music with either of those two.
MTPG might be the way to go.
However, beware of fakes online