There are a few reasons why you might choose to use Affinity Designer instead of Adobe Illustrator.

• Affordability: Affinity Designer is a one-time purchase, while Adobe Illustrator is a subscription service. This means that Affinity Designer can save you money in the long run, especially if you plan on using the software for a long period of time.
• Performance: Affinity Designer is known for being a very lightweight and performant application. It can run smoothly on even older or less powerful computers. Adobe Illustrator, on the other hand, is a more resource-intensive application.
• User interface: Affinity Designer has a clean and modern user interface that is easy to learn and use. Adobe Illustrator has a more complex user interface that can be overwhelming for beginners.
• Features: Affinity Designer has a wide range of features that are comparable to Adobe Illustrator. However, there are some features that are only available in Adobe Illustrator, such as the ability to create and edit 3D objects.