What's special about Manjaro? I guess it is geared towards geeks?
1 It is a rolling release which means you get up-to-date OS and programs without having to wait for the next release. They try to keep close to the bleeding edge, but not too close.
2 It is the only Arch-based distro that you can use successfully without being a total linux expert. Arch has a vast software base, and the best documentation.
3 It is very well maintained and has many desktop options. For instance, their version of Gnome looks much better than Ubuntu's, in my opinion.
These were the good points. there are also bad points. It's harder to use, and more likely to cause issues because of the constant updating.