You can create a Unity-like look and feel in KDE Plasma 5 relatively easily[1]. Although the look and feel is only part of the experience, KDE Plasma 5 is very customizable that I'm sure it could be adapt fit to most workflow.

Despite its bad reputation in early days, KDE Plasma 5 nowadays is very lightweight. As in, the resource usage is pretty much on par with Xfce.

[1]: https://userbase.kde.org/Plasma/How_to_create_a_Unity-like_l...