Stating it's a fact means there needs to be supporting proof.
You're absolutely right. When writing my previous post I did start including a description to back up my claim, but the response was getting very long so I cut it out. Reading my previous post again I see that it sounds rather arrogant - that certainly wasn't my intention.
To be completely honest, I feel like we're drifting very far off topic from the OP's original question and I'm not sure whether this is the best place for this discussion. Nevertheless, here's the test I'd encourage everyone to try when comparing any raw converters (not just Lightroom or Aperture). Apologies in advance for the length of post.
Go outdoors a couple of hours before sunset on a bright day & take a south-facing wide-angle photo that includes both scenery & sky. Doing this 2 hours before sunset reduces the chance of the sky containing a lot of different colours - what we're looking for is a nice smooth gradation in the sky from medium-blue high up to very light blue (perhaps even white) right at the horizon. If there are some wispy clouds in the sky that's even better as it will help highlight any differences between raw processors but you want a mostly clear sky with a gradation in lightness.
Aim at the sky & set your meter so that it's overexposing the image by 2-3 stops (We're keeping some foreground in the shot and facing south, so we'll need to overexpose the image to prevent the land going to pure black), then, shooting in RAW, take your photo. If you've got blinking highlights turned on then they'll be going crazy - it's fine, the detail will be there in the raw file.
When you get home open the same image in both aperture and lightroom (and any other converters you want to try this in). The aim here is simply to make the shot look like the camera had exposed for the sky, not the foreground, so take the exposure slider and reduce it by the same 2 stops you overexposed by in camera. Don't move any other sliders to try & make the image look it's best, just compare the conversion. The 2010 algorithm in lightroom usually gives more accurate results than 2012, but be sure to try both (many will argue that 2012 looks better, but once again, this is subjective. Even with the Highlight slider set to 0, 2012 adds Recovery to the image to reduce clipping. You'll notice the difference in red clipping between the 2 algorithms. This dramatically flattens the image and reduces fine detail).
Regardless of camera, every time I have seen this experiment tried aperture can produce far more natural skies from the blown out detail. Lightroom's blues are always too intense and most of the time an unusual yellow cast is given to the sky as it nears the horizon where it should only get lighter (this is why it's important not to do this during sunset).
If there were whispy clouds in the sky, Lightroom's will have a harsher look, not the light & translucent look you actually saw with your eye - this is particularly evident around the edges of the clouds. Aperture keeps more smooth gradations within the clouds, and the edge between the white cloud and blue sky is far more natural.
A similar experiment is to shoot photo of a person, but overexpose them by the same 2-3 stops. When you lower the exposure in the raw programme, aperture can recover far more information from the blown out skin tones, where lightroom will leave areas of pure white with harsh, jagged edges.
We're not paid by these companies so don't have to defend them - if we want to find the best tool for the job then don't believe the marketing hype, do the tests, be honest and be critical of the results. I'd be interested to hear what people find.
Apologies again for this long post, but I hope it's helpful to those interested.
All the best.