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I've seen both and I guess it would depend on if you're drawing at the last second once a deadly threat is determined.

The 4 step draw "pauses" at the chest in a sort of "low ready" position, which takes a bit of time.

However, the "straight line" draw has the disadvantage of "casting" the weapon, with perhaps a bit of lost control.

At least that's how I see the differences. I generally use a draw, rotate weapon toward the target and then extend.