There's also Falkon, now a KDE project, which I prefer. The UI is more like Firefox, and it's QtWebEngine-only, which is maintained, unlike QtWebKit these days.
Seems somewhat revived/maintained by annulen [0] as pointed out in these release notes. Also, QtWebEngine seems to usually be behind a Chromium version or two which, among other reasons, is why I use CEF in my Qt-based browser (granted I'm behind a couple versions on public releases, but that's my fault).
Yes, that QtWebKit revival is interesting and worth watching. I haven't followed, but I'm still not sure if it's up-to-date. This blog post from a WebKitGTK+ (with a section about QtWebKit) developer from 2017 is the best info I could find: https://blogs.gnome.org/mcatanzaro/2017/08/06/endgame-for-we...
And yes, QtWebEngine does not keep up with Chromium, but it is updated to some degree. I wish Qt and distros could at least keep better up-to-date with security fixes, but it's easier said than done!
https://www.falkon.org/