Preferred outline type in 2019 for webfonts and browser compatibility?

I'm curious what the current advice is on whether TT or PS outlines are preferred for webfonts nowadays.

Years ago the advice was to use TT outlines (based on body text hinting on Windows GDI  + ClearType)

Then an old Typekit blog recommended PS outlines because of horizontal smoothing ( https://blog.typekit.com/2011/07/26/new-from-typekit-improved-font-rendering-on-windows/ )

Now, with DirectWrite being dominant on Windows (at least Chrome browsers), I suppose either format would work.

I've noticed some "webfont generators" are still spitting out TT-outlines regardless of what goes in.  I haven't unpacked any woff2 files from Google fonts to see what format they are using, and I haven't gone through the list of what text rendering engine every browser is using either.

What about other OS/Browser combos: Does anyone have any current "best practice" recommendations?   

Thanks,
Joseph