(white, for what difference it may make)
My black iPad mini and skydemon is yet to let me down - I always mark up the chart and write out the PLOG the way I like to (I don't like the printable SD one) so should it fail there would be no worries.
Being near Stansted it helps me be certain not to wander into their airspace - A friend of mine was accused of infringing and the tracker on SD proved that he hadn't. Without that proof I'm sure he would have been in some hot water as it would have been a case of his word against theirs.