Over the last few weeks I've started to trial Phabricator, using the hosted Phacility.com service. I haven't actively migrated any code yet, but just using Phabricator to manage some workflow elements is a much enhanced experience. Phabricator's Maniphest (tasks, issues) and Project Workboards feel much more intuitive than GitLab's. The Kanban board on GitLab drives me insane with the amount of clicks I need to do things, small glitches with tags and lack of a single unified multi-project view. Perhaps I haven't used Phabricator enough yet to hit such little frustrations.
The point is, I'm probably going to migrate all my personal work over to Phacility.com and if things continue to move smoothly recommend using Phabricator at work, mostly for their workflow and project management tools.
I should make it clear that as a developer, I'm just messing about for my own interest. Professionally, I'm a project/product manager with a small team of developers and scientists. I wanted to try and standardise on a single tool to manage workflow, while still staying out of the developers' way while they did the important stuff of building the product.