Which node do you use for a rendered DOF?

A quick question:

I have a beauty, a luminance depth, and a DOF pass of a 3D render. My impression was to create lens blur you have to apply the DOF as a blur to your image. The nodes that I thought could do this well enough would be Blur and ZBlur but which one would create a more accurate DOF?

My thought was with Blur –

Input beauty and mask the blur with DOF.

With ZBlur –

Input the beauty, use the lumDepth as a Z channel, and mask with the DOF pass.

Since ZBlur uses more information, I assumed that that would create a better blur in my scene but I could be easily wrong about that. Could anyone take a quick moment to clarify between the two? Thank you for your reply in advance.

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