I'm afraid you're mistaken. The exposure control in Aperture is far better than the one in Lightroom and is one of the reasons many people (me included) switch from Lightroom to Aperture.
I'm not saying that just to voice my preference against yours. This isn't my opinion - it's fact. And, fortunately, it's very easy to test. Try this:
Grab your camera and head outside. Take an over-exposed photo that has sky & clouds in it. Over-exposing by 2 or 3 stops should do it. When you look at the preview on the back of the camera, you should see most of the sky flashing. That's good - the preview, histogram, etc are based on the jpeg, not the raw. The raw file contains far more data than the camera preview shows you.
Now head back indoors and open the image in both aperture & lightroom. Don't touch any controls or apply any presets, just let both apps create their default preview. Now, using only the exposure slider, underexpose the image by 2 stops. You'll immediately see that Aperture brings back more highlight detail and retains more fine gradations in the sky & clouds.
Lightroom leaves the brightest highlight areas blown out and creates a horrible grey halo around a lot of fine gradations. It can also struggle to bring back natural colour details in the light areas where the sky nears the horizon (often adding a yellow hue to the blue sky).
You may prefer using Lightroom, and that's absolutely fine - its a great piece of software. But Aperture's underlying algorithm is just better. For some reason, it's able to extract data from the raw file that Lightroom simply can't (as you'll see when it generates a JPEG preview from the info in the raw file).
Lightroom has some good tools, but the fact that it can't use all the information contained in the raw file essentially limits what you can do with your camera.
I've had a look at your site - your photos are really fantastic. You clearly know what you're doing so I really hope this reply doesn't sound conceited - I certanily don't mean it to.
I hope that helps. And keep up the great work!