I'm also curious. Affinity is compatible with Windows which is a huge advantage. It looks like affinity has more features but is also 30$ more expensive, which is not a big deal considering how powerful it is.
Amadine has a simpler (probably cleaner UI), solid path-editing tools. It doesn't have anything like Affinity's filters or history, but does include one thing I miss from Illustrator: an easy-to-use, straightforward variable-width editing tool.