When I first got my Mk3 three years ago I used the default skin for a few months, but then discovered that the other one presents the options in a more efficient way (IMHO). All, or most, options are available form a single screen. So for the last nearly three years I have been using the alternate skin.
Now (having just had a speeding ticket) I am making much more use of the limiter options, which loses the clock on the multi-information display, so I am using the clock on the Infotainment screen more. I much prefer the clocks available in the default infotainment skin so have gone back to it.
More about skin change (not to be confused with themes) on p266 of the manual.