So my choices are SPBT and HPBT...correct?
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Looking for a general purpose bullet, we might put it that way, indeed.
What many of us seem to forget is that bullets, all of them, are nothing but a compromise between penetration and expansion (we could add accuracy to make it even more interesting and or confusing...). Too soft a bullet will give superb expansion but might fail to penetrate deep enough. Too hard, a bullet will penetrate lengthwise, making pencil holes.
I suggest therefore that the case of the perfect bullet be linked with another myth, i.e. the universal rifle/caliber, in order to guarantee many more years of our ongoing discussions...