I'm looking for something with solid EPS import and export. So far, I've found Sketch flakey (some things imported incorrectly, other things cause visual glitches), OmniGraffle great except when I export a document as EPS which has other EPS-imported elements embedded in it, they appear to be rasterised (which defeats the point). And that's pretty much it–Pixelmator, despite becoming more of a vector tool, doesn't support EPS at all. Inkscape works flawlessly except that it's awkward to use on a Mac, especially without retina support (which is somewhat crucial for an graphic editor).

I've just tried Affinity Designer and it seems like it has good EPS import support (all elements editable etc.) and EPS export, but the exported EPS appears rasterised. When I open it up again in Affinity Designer, it's no longer editable. But maybe I'm just doing something wrong...