"It is more difficult to use an yi xing teapot with this tea. Often, you get more concentration with yi xing, which dampens the floral aspects. You would have to use a pot that is less porous and carefully select the right combination of tea and temperature in order to do well. On the other hand, with a gaiwan you have a larger opening, which makes it easier to detect the florals. It also provides better temperature control."
Aha, now I know why so much Taiwanese teaware is either glazed or porcelain. Bottom line, for carefree brewing and best results, go with a gaiwan when you prepare these popular, fragrant oolongs.