Question: Hi everybody, Launch X431 Diagun or launch x431 Master? Which to buy ? Does Diagun works as good as X431 Master ? Any help to decide would be helpful. Thank you in advance. Answer: Diagun is faster,the software are same New Master is good. Because it needs not to download software, so speed is quick. If you do diagnostic on vehicles which have more than 12V - 14V than Master is better option! Diagun is smaller; it has Bluetooth, test two cars at the same time. If you can update it I think both them are very good.