To summarize, here's a list:
- $50 price tag - no shitty SaaS model
- Switch between vector, pixel, and export modes - hell yes
- Asset Management - reuse elements with ease. See it in action
- Symbols - basically the same as sketch but with more advanced options. See it in action
- Constraints - Affinity's version of auto layout - This existed before the auto layout plugin in Sketch everyone keeps yapping about. See it in action
- Over 1,000,000% Zoom - no joke
- Instantly undo/redo over 8,000 History steps
- Shareable Color Palettes across the application, the document, and export as a file. See it in action
- Real-time gradients, effects, blend modes and adjustments - This is more useful than it sounds
- Autosave & Snapshots
- Extremely similar key commands as Adobe products
Everyone will probably nag at the lack there of plugins and that's fine. Affinity Designer comes bundled with so much functionality I don't feel plugins are a good end game personally.
I've become a fan boy of Affinity Designer and Affinity Photo. I'm not affiliated with them at all. I just want to spread the word of this software. It's pretty nuts everyone is stuck in Sketch-land when all this potential is available for both Mac and PC.
*Also, I still use Photoshop, Illustrator, and Sketch in my workflow. Affinity is just leading the race for me.