"Developing" raw files in iPhoto vs Photoshop Camera Raw. Observations ...

I need to generate 3 "exposures" from a large group of raw (Nikon D200 NEF) format images. A bracket of sorts: 0 ev, -2 and +2. Ideally I would like to do it in iPhoto since It would be much faster than opening each photo in Photoshop ACR and saving it from there. But I was concerned that the quality of the "developing" would not be as good in iPhoto than in PS.
However, when I generated my 3 exposures by using Edit > Adjust > Exposure slider and setting it to +2 and -2 then saving as tiff16 and then compared those with the same 3 exposure created out of ACR, I find that the iPhoto version does a much nicer job keeping the very bright highlights in check. The PS versions seem to have much more clipping in those same highlights.
Has anyone noticed this? Is iPhoto actually better than ACR at generating different exposures from raw files?
Thanks for any help.
Bo
P.S. Changing the exposure is the only thing I have modified. Everything else is left at default.

Thank you guys. I think you are probably correct on this.
Terence, re: Aperture and NEF, I know this was discussed a lot a while back but I've been out of the loop for a while. Since the raw converter is at the OS level, does this mean that iPhoto and Aperture use the same converter and therefore should yield the same results at that level?
Thank you
Bo

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alessandroavenali wrote:
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"Developing" raw files in iPhoto vs Photoshop Camera Raw. Observations ...

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