ok, here's just my two cents on winter vs. spring Taiwanese oolong. Typically, at least in my opinion, spring oolongs tend to be more floral, and more delicate in flavor. Winter oolongs though usually have a richer taste to it. My theory is that tea leaves grow more slowly in the winter so each leaf has more flavor. At least in Taiwan, spring oolongs are usually highly priced, but it all boils down to what you like. Also, the roasting also plays a huge factor in how spring or winter oolongs taste.