Per the Dillon website, all their revolver dies use the accu-crimp die.
The accu-crimp is a two-stage crimp die. It starts with a taper crimp, which is sufficient for lighter loads. If a firmer crimp is needed, adjust the die down further. This applies a roll crimp on top of the taper crimp, giving a firm grip on the projectile.
You will want the roll crimp.