(05-26-2019, 08:34 AM)Kludge Wrote: What are the big differences between Manjaro and Ubuntu?
Great question. Manjaro and Ubuntu are both very popular Linux distributions (distros), AKA _flavors_ of Linux.
In a nut shell, Ubuntu is a distro based on the _Debian_ distribution, while Manjaro is based on _Arch Linux_. So the understand the differences, you have to understand the differences between Debian and Arch, then understand the differences between the parent and child distributions.
Without getting too deep into details, Manjaro uses a rolling release model with the *pacman* package manager, where Ubuntu uses a stable release model with the *apt* package manager.
The release models differ like this: Manjaro favours having the latest version of software as soon as it is released. An example: the programming language Ruby version 2.6.3 was released last Christmas (2018); not long after, Manjaro users were able to use pacman to install Ruby 2.6.3 directly.
Ubuntu follows a stable release model, with predetermined binary updates slating for a stable user environment (imagine Manjaro as the wild west, where packages of software are updated independent of each other without much consideration to the interoperability between them... Although Manjaro attempts to stabilize this a bit, that's for a different conversation). Using apt, I believe the version of Ruby that can be downloaded is 2.6.1 (don't quote me... I only use Ubuntu for servers, and I don't use Ruby anymore for production).
In short, this means that the most stark difference will be _not_ what software packages you can install, but which versions you'll be able to install. Also, using a rolling release model, stability between packages will break from time-to-time, although Manjaro does a great job of preventing this. Still, it may happen, but the remedy is pretty simple with some DuckDuckGo-fu. Ask yourself this: Do I want stability with slightly aged software packages, or do I want the latest binaries with the potential to have some manual work to maintain your system from time-to-time.
I don't think you asked for it, but my preferred distro here is Manjaro. I am actually an Antergos user (another distro based on Arch, although the project was recently canceled.... Sad Â

), which is also a rolling release-based distribution. For personal computing, I prefer the rolling release philosophy. It keeps my system consistently up-to-date with software, with the latest features and bug fixes, with an emphasis on the bug fixes.
Manjaro, as you said, is also newbie friendly. For that reason I'd go for Manjaro. But now you'll need to determine which desktop environment you'll want. But that's beyond the scope of my reply.
Best of luck.
Links:
Desktop environments
https://itsfoss.com/best-linux-desktop-environments/