This article may be relevant(I actually posted it on a subwoofer thread too) - it is all about trade-offs and what do you call "better" - is "better" more accuracy (good transients) or is it just copious bass (wow that thing makes lots of bass at LF).
"There thus evolved two camps of woofer design: those with strong magnets, having better transient accuracy but worse LF response, and those with weaker magnets having good LF response but poor transient response. However, the poor transient response of a sealed box with a woofer having a weak magnet pales into insignificance alongside the
wholesale demolition of the waveform that takes place
in reflex, bandpass and transmission line speakers."
"There thus evolved two camps of woofer design: those with strong magnets, having better transient accuracy but worse LF response, and those with weaker magnets having good LF response but poor transient response. However, the poor transient response of a sealed box with a woofer having a weak magnet pales into insignificance alongside the
wholesale demolition of the waveform that takes place
in reflex, bandpass and transmission line speakers."