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Pro Compatible with Photoshop PSD files
Affinity Photo can import and export .psd files.
Pro Interface will be familiar to those coming from Photoshop
The interface, especially the Photo persona, is laid out in way that's very similar to Photoshop - a panel for icons for tools on the left, a panel for information and settings on the right.
Pro Personas allow separation of concerns
At a high level the interface is organized into broad groups of tools called Personas. Personas like Photo for in-depth image manipulation, Liquify for warping the image, Develop for basic RAW photo development and Export for exporting. Each persona displays only those tools that are needed for that task.
Pro Lifetime updates
Pay once, get updates forever.
Con Limited selection of plugins
Plugin support was only recently added to AP and not many plugins have been created for the program so far.