I don't know the physics behind it, but for me a tapered string is much richer in harmonic content, which I suspect is because it has a much cleaner break over the witness point on the bridge. It'll otherwise have exactly the same, more or less, low end as any other string of the same gauge. At the end of the day, all strings are a thin core with wire wrapped around it, with tapered ends.
I like both, depending on the bass. My stingray loves a tapered B, my Alpher doesn't. No idea why!