I've been using Lightroom quite intensively, and I would agree with many people that it has a pretty good RAW developer module. However, the module in Aperture in just as good if not better, IMHO, I think some things aren't as obvious as in LR.
To be really up front about this, I'm leaning toward Aperture more and more each day.
Some things that have been brought up that were pro-LightRoom were:
- Good tonal control (curves)
- BW mixer
For my purposes, these were major pro's for LR as well. However, Aperture especially since 1.5 has a lot of good useability in this regard as well.
- Tonal control: The levels control is very powerful, and can get pretty much all the same results as curves. However can be difficult if you're used to curves. With 1.5, I've made presets with my most often used curves. All I need to do is select the preset and fine tune as needed. (e.g. Std S curve, Expand highlight, compress shadows presets with varying strengths)
The trick is how to make the actual presets. There is a good guide about translating a curve to a levels adjustment at:
http://insideaperture.com/Site/Inside%20Aperture.html
- Grayscale mixer: I personally prefer the Aperture mixer more. The LR mixer by default has more adjustability, however I find that the controls are just a little over engineered at least for my taste. I'm quite happy with just an RGB adjustment in Aperture. Similar to the tone controls, making a few presets quickly allows me my most often used combinations.
I also prefer how presets are accessed on Aperture vs Lightroom.
The Highlight and Shadow are also a lot more powerful than in LightRoom. Overall, with the proper setup and customizations, I'd say Aperture has a more powerful RAW developer than lightroom.
I also find that the Exposure, Contrast, Brightness controls in Aperture work as they intuitively should. Lightrooms controls produce a fairly different output.
When it comes to DMR, then Aperture is king.