Once again, a person who wants suggestions without giving information about what he prefers. I hope you have done research for I am not in the mood to write down the history or the philosophy of both arts.
Wushu. Great workout, many forms that will enable you to become more agile, flexible and stronger. Later on, weapon will be included in the syllabus. Many high kicks and flashy stuff.
Wing Chun. Great SD art. Hand speed will increase, as well as accuracy. Many deceptive techniques. Not so many kicks and almost no Flashy stuff [unless you consider striking at the neck area with 10 punches within 2 second flashy].
I need more information on you if you want me to elaborate my suggestion. I'm not doing both of these arts but I have a sound knowledge of theory concerning both of these arts.
For now, no suggestion until you have given more information such as what you will use it for, what's your goal, what's the point in training, what you like [not personal stuff like apple pie, I mean technique wise, like grappling/striking] and what's your area of weakness [again, not personal stuff, I mean like unagile, weak, fat skinny, whatever].
-Taison out