[vacri]

https://bugs.launchpad.net/ubuntu/?field.tag=unity8-desktop&...

They look like they have only had half a dozen bugs lodged in the last six months. Doesn't seem too vibrant for an actively-developed desktop.

[shakna]

https://bugs.launchpad.net/mir/+bugs?orderby=-date_last_upda...

Mir on the other hand, looks quite active.