A little over a month ago, I compared Lightroom and Aperture and decided to use Aperture. Since then, I've been watching several videos on YouTube, which has helped me understand Lightroom a bit more, so I decided to try Lightroom one more time.To start out, I exported the images out of Aperture to a new folder. While importing them into Lightroom, it was then that I noticed that most photos were missing the keywords I had tagged them with in Aperture. After do some research online, I learned that JPEGs and TIFFs need to have the metadata embedded in the files while RAW files would have the metadata in XMP sidecar files. After re-exporting the JPEGs and TIFFs with the metadata embedded, I re-imported those files and the keywords were there but I still lost the hierarchy I had established in Aperture. I did have to re-tag the TIFF files as there was an error when exporting them from Aperture with the metadata embedded. Luckily, the TIFF files are only family photos I scanned to preserve so that task wasn't so bad. I'll continue to use them both side-by-side since I prefer Aperture's integration into the OS and also like that there is more training, plug-ins, and presets available to Lr. Even though I'm still testing out Lightroom, I decided to sign up for the photography package from Adobe for $10/month which gets me access to Lightroom and Photoshop, as well as the new Lightroom mobile for iPad.