Well, where to go if you can only go to Scott Base or McMurdo. Sounds obvious, right?
Maybe not... if you're a sun lover (and who isn't), you'll soak up slightly more rays at McMurdo than at Scott Base (assuming that you even go outside).
The following plot was generated by taking the sunshine energy arriving at Arrival Heights (just above McMurdo) and subtracting the sunshine energy arriving at Scott Base. Positive numbers (blue) correspond to McMurdo being sunnier, negative (green) mean SB was best. The red running line shows the 5 times exaggerated 7 day average of all years from 2000 to the present.
So, if you want to sunbathe, McMurdo's the place to pick, especially while the light is going or coming.