LXQT is a lightweight and modular desktop environment that is a port of LXDE written in qt.
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Pro Lightweight emphasis
With a focus on being "light-weight", it is to KDE Plasma what XFCE is to GNOME: a familiar enough looking lighter alternative to the more fully featured environment that may work better on lower-end devices and for people who want as lean a system as possible.
By taking advantage of the modular KDE Frameworks, LXQT is able to offer a modular architecture that allows the user to easily swap components.
Pro Beautiful GUI using KDE's Qt so it looks familiar
Con Still in early developement
LXQT is still in early development which may mean missing features or instability.