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I have actually switched to Affinity. I've been using the selection brush, which kind of works but it doesn't. It automatically snaps to edges, but it often doesn't recognize boundaries very well. In some areas I went over the edges with a thin Smudge brush to try to smooth them a bit, which helped but didn't solve the problem.

I could try to switch to the polygonal lasso (though I would have to hold shift the entire time because it's a sub-tool of the regular lasso tool). With the polygonal lasso tool, I can click a bunch of points and it would draw straight edges between them. After that maybe the selection brush could be useful for touching up the edges.

I don't own a copy of Photoshop, so I don't know what the pen tool does. Is it a selection tool?