You are really talking about the same thing, sort of. A standard taper crimp die does just that, crimps. The Lee Carbide Factory Crimp (CFC) die for auto-pistol cartridges is a taper crimp die that adds a carbide ring to size the case body at the same time as you crimp.

The CFC die is principally intended for bullets of nominal or, if you will, "Standard" diameter for caliber. Either with slightly thicker brass or bullets larger than "standard" it can re-size the bullet at the same time it is sizing the case. Not so much with the tapered 9mm case, though.

"Standard for caliber" would mean:

.38/357 .357"
.44 .429"
.40/10mm .401"

And on, and on......

If you load or need bullets bullets larger than the nominal diameter for your caliber the CFC isn't going to work for you.

I use Lee CFC on 9mm. It helps to remove the "coke bottle effect." It seems to be helpful on 9mm if you don't trim your cases. I suspect its value is purely cosmetic if you do trim cases.

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So far on all my rifle stuff I have only ever neck sized with
collet dies and never needed to crimp.
It is the pistol stuff I am gearing up for that is a bit
confusing. 10mm first

Thanks