In the US, they're the same.
Are you sure?
I've always thought of universities as educational institutions funded (in part) by the state. So, tuition for "The University of Colorado" is partially subsided by the taxes people pay to the state of Colorado.
Colleges are not funded by the state, therefore have a higher tuition than universities.
At least that's the theory. However, both universities and colleges have become so profit focused, I don't know how much cheaper universities are now-a-days.
I'd also argue that a university in the U.S. is more prestigious than many colleges (the exception being Ivy league schools), because universities being cheaper means a high demand for being accepted, which means applicant need "be better" to gain admittance.
In the job market, however, you are absolutely right: college VS university - it doesn't matter.
Others have given a good description of what a launcher is.
But my reason for why I use a custom launcher is simple : I want a consistent UI experience, regardless of whether my current (or future) android phone is a Google, Samsung, OnePlus, ect.
For me a phone is tool, nothing more. I don't have the time or interest to "explore" the difference in UI's. In fact, Samsung's Launcher (Bixby?) inferriates me the most as the default "back" and "apps" Buttons are inverted compared to many other launchers... so it messes with my muscle memory.
With a custom launcher (I use Nova), I can restore/import my settings on any device (or custom version of android like lineage) and I've got the same familiar interface. Actually, Nova is quiet nice as it'll also show you greyed-out Icons for all the apps you has on your home screen. As the apps are installed, you can start to use them. This (for me) makes moving to a new phone much easier.