When comparing Aperture vs Pixelmator, the Slant community recommends Pixelmator for most people. In the question“What are the best image editing software tools for Mac?” Pixelmator is ranked 1st while Aperture is ranked 16th. The most important reason people chose Pixelmator is:
Pixelmator's interface is pleasant to look at, easy to use and specifically optimized for OS X users, making it very intuitive for long-time Mac users.
Specs
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Pros
Pro Integrates well with other software via plugins
Aperture has plugins for DxO Pro, Capture One Pro, Lightroom 5 and Photo Ninja.
Pro Clean, intuitive interface
Pro Beautiful, easy to use UI
Pixelmator's interface is pleasant to look at, easy to use and specifically optimized for OS X users, making it very intuitive for long-time Mac users.
Pro Feature rich
Not only does Piexelmator provide easy to use tools that you should expect in any image editor, it also has rare tools such as layer styles, liquify tools and OS X optimized, fast image manipulation engine among others.
Pro Supports layer styles
Layer styles allow non-destructively applying effects to a layer.
Pro Powerful effects
Dozens of visual effects available, easily discovered from the visual Effects Browser, broken into categories. Effects have interactive dialogs and live preview.
Pro Multiple-display support
Pixelmator can be used across any number of monitors.
Pro Loads quickly
Gives you common image editing capabilities almost instantly.
Pro Great performance
Pixelmator's image engine is specifically optimized for use with Macs, providing one the best performance results available on OS X.
Pro Inexpensive
Pixelmator costs just $30 on the App Store. Additionally, it often comes bundled with other software that you might also find useful bringing the price down.
Cons
Con Unsupported
Apple has said they won't support the application anymore.