I can understand people wanting to run 10.6 on machines that shipped with 10.7 to get Rosetta but I'm not sure what would be gained by running 10.9 on a 2014 Mac Mini if it is even possible to hack it to run it.
If you can get the installer from somewhere you can make a bootable USB and there should be no technical reason why it will not work (you'll need to wipe the drive though so that the installer does not complain)...
but I agree with mdgm, you don't lose anything in Yosemite from Mavericks, but gain some additional great new features... if the look of it is the thing that makes you want to go back.. well, its your choice but that means you're stuck on 10.9.5 for a while, there will be no going back visually...
I would stick with Yosemite...I'm running it on my older macbook 2009 2.26 unibody (4 g ram,and old 5400rpm 250g spinner) and I find 10.10 runs as good if not better then did 10.9.....
I would stick with Yosemite...I'm running it on my older macbook 2009 2.26 unibody (4 g ram,and old 5400rpm 250g spinner) and I find 10.10 runs as good if not better then did 10.9.....
I find Yosemite to run quicker on my base 2012 Mini than ML and Mavericks. It also has a smaller footprint. I find Safari to load really quick in Yosemite as well as the rest of the default programs including Numbers and Pages. Oh and I loves the new look.
Compared Photoshop tasks on Mac mini 2012 (i5) under Maverick, Yosemite, and El Capitan with a stopwatch. Maverick won, followed by El Capitan, Yosemite was the worst. So I stick with Maverick. I like the look of flat design, though.