I've tried a lot of the newer tools, of which I like Sketch and Framer the best. However, nothing seems to beat paper+pencil and then directly going to code. Somehow, static design tools have never been able to capture what's possible in web, and what's possible now with canvas, SVG, CSS3 transforms, etc is even more than before. Recently, CSS Grid Layout went gold in major browsers, and Flexbox has been supported for a while, so there's no good reason for CSS frameworks anymore either (would read http://jensimmons.com/ for more on this). Exciting times in web!