I had both. I just sold my Dillon. I looked at it like this.
Trimming with the dillon takes zero time because you're doing it while you resize. However, you then have to chamfer and deburr afterwards, so you have to do two more steps.
With the giraud, you trim, chamfer, and deburr in one step.
So to resize and trim with the dillon is three steps, while to do it with the giraud is only two.
This assumes you chamfer and deburr which I do. Some do not.
Darren