The 38 special and 357 Magnum dies came out with a roll crimp as standard equipment, that would work with the lead bullets and also the copper jacket bullets that had a good cannelure on them.

With todays plated bullets the "Can" is minimal or not even on the bullet........
so a taper crimp is best for this style of bullet.

You can set a roll crimp to where it just takes out the belling of the case for
auto pistols or plated bullets.
You only need to crimp medium to heavy loads in your revolvers, if there is a chance of bullet "Pull".