Using Ubuntu in our development and production environment. It's rock solid. However might switch to Kubuntu as it appears to have better HiDPI support through plasma compared to gnome.
You should also consider KDE Neon, an 18.04 base but KDE/Plasma directly from the devs. If you use Snaps for your useland tools you have very stable base and a super up-to-date userland. I'm very happy with it.
Just wanted to add my support for KDE neon. I used kubuntu back in 16.04 and switched to neon instead.of the next LTS kubuntu and I haven't regretted it. Plasma feels a lot more stable and up to date than it did with kubuntu and I haven't had any problems since switching.