I gave up on Affinity Photo after discovering that it degrades images as you edit them. Specifically, it blurs entire layers when you merge them. And it does so over and over, making the base layer worse each time. Therefore you can't trust it with your images. Affinity has refused to fix this, making excuses instead. Example here: https://youtu.be/QA8eVWOLL5I

Affinity is also unwilling to fix glaring UI blunders or omissions. For example, in Designer, people have been asking for a "print/no-print" toggle on layers for years. Everybody else has this. But nope; they have staunchly refused to add it.

So I bought Pixelmator. It's a little clumsy to use in some ways, but the authors have been good about responding to queries about it.