Spacecraft: Shenzhou 7 or Shenzhou VII?

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Hi, mylotters, I have a question here, you know a Chinese spacecraft with 3 crew members was launched on September 25, and landed back on earth on september 28, and the name of the spacecraft is Shenzhou 7 or Shenzhou VII, which are two versions of translation according the official websites of different countries like China, USA, UK, but I was wondering which looks better, Shenzhou 7 or Shenzhou VII. Personally, i think Shenzhou VII, i mean VII is a formal choice rather than the arabic number 7. What's your opinion?