Logically speaking, there should not be any difficulty in choosing between those 3. The matter was direct and simple.
Making a choice between dark gold / silver storyline / dark blue equipments, was like going to a brothel and of the three girls to choose from, one looked like Zhang Ziyi, another looked like Liu Xiaoqing, and the other looked like Lady Pomegranate. It was a matter that could be decided without even using the brain.
(Zhang Ziyi: https://www.google.com/search?q=zhang+ziyi&tbm=isch)
(Liu Xiaoqing: https://www.google.com/search?q=Liu+Xiaoqing&tbm=isch)
(Lady Pomegranate: https://www.google.com/search?q=石榴姐&tbm=isch)
The reason Sheyan was hesitating was because he was responsible for the whole party as a party leader. If he chose the 'Entanglement of Victory', then it was almost certain that the whole party would have a very difficult time in the Harry Potter world in the future. There were a lot of profits to be gained in the Harry Potter world!