It makes no difference except one more name. If you want to sign, buy a signed version. If you think it doesn't matter whether you have a signature or not, buy the unsigned version. The signature version can be a little more expensive, but not much. If you want to buy something cheap, you can buy it on Zhuo Yue. Everything sold in Zhuo Yue is unsigned, but it is absolutely genuine, over 30. If you want a signed version, there is no signing ceremony now, so you can only buy it from others, but it is not necessarily a real signature, but it is better.