- Monokai
- Dark+ (this is a slightly modified version of Visual Studio Default Dark)
I consider both these schemes better than 2018's Default Dark theme. I particularly do not like gray comments on an almost-black background because the contrast is too low.
I've made a partial start on Dark+, which can be found at http://fastie.com/z/blumentals/themes/Dark%20Plus%20(VS).xsc. It only has settings for PHP; I haven't gotten to HTML, CSS, or JS yet.