Aperture or Lightroom and why?

Apple stopped offering the trial version when they switched to selling through the Mac App Store (about 18 months ago)

I prefer Aperture because:

- I find combining the asset management and post processing in one program suits my way of thinking

- Aperture (plus some plug-ins, like Silver Efex) gives me all the adjustments I need. On the (very) rare occasions I want more, I go to Photoshop - maybe twice this year)

- But - Aperture needs a muscular Mac - my 27" 2011 iMac with 12GB is fine, but my 24" iMac with 3GB struggled - not impossible, but slow. For what it's worth, my Aperture Library is about 200GB