To me, Git via the command line, constitutes industry "jargon". It's used - wrongly - to help exclude certain people within the broader culture. Git + CL === elitist.
It's also anti-dog food'ing. But perhaps this helps explain why so many UIs and UXs are so subpar? That is, the less you use something (i.e., a proper UI) the less you learn about them?
p.s. What about SourceTree?
Personally I prefer the command line, but I imagine your coworkers will be a lot more receptive to using version control tools the way they're used to.
If you're concerned about command line complexity, you can try out gitless: https://gitless.com
It's a simplified command line interface to git, designed by looking at how users actually use git.