As an aside, since this kind of applies to the OP’s question:
Lightroom and Photoshop are not competing products; they have entirely different purposes. Photoshop is an editor, albeit an extremely complex and multifaceted one. Photoshop is for editing a single photo, right down to the pixel level. Lightroom is all about file management and workflow. It’s there to get your photos from your camera, 0n the order of hundreds and thousands, on to your computer, into folders, organized and sorted, ‘developed’, tagged and keyworded, and exported to various formats, editors, and social media - as quickly and simply as possible. Yes, all these things can be done in Photoshop’s Bridge, but it’s not near as efficient when working in large quantities. Likewise Lightroom has added more localized editing options in recent versions, but it’s nowhere close to as powerful as Photoshop. Hence many digital photographers own both: Lightroom to manage their workflow and basic developing, and Photoshop for heavier editing, compositing, and layout. Other’s don’t like heavy post processing and only use Lightroom, and still others don’t shoot large volumes or prefer managing their own files and stick to Photoshop and Bridge.
In summary: Aperture and Lightroom are similar products. Photoshop is a different beast entirely.