I've switched from Sketch to Figma, and I'm quite happy about it. I'm also using Affinity Designer, which is a fantastic complement to both.

But I'm odd—before Sketch, I used Antetype. I really miss the unique layout engine of that one, but the app fell into neglect and started lagging behind the competition in many aspects.

Edit: As it turns out, Antetype might be revived! [1]

1: http://antetype.com/