This is my advice to you. It may not be the most popular advice but ot is worth consideration. So both sellers claim that they provide original stuff. It is very clear where the problem is and it can easily be solved by you. It is you that is brining up the problem. Let me give you simple scenarioos to explain this. if someone is selling a n sd card for 500 and another one is selling a similar one for 900, which one will you buy. You will obviously go fir the 500 one. A person will never sell a similar thing for a higher price unless it is better than the cheap one. There is no need for you to get a pirated software. To sell something cheap it means that it is not the original. Confirm from both sellers if they provide after sale services incase tjhings go wrong with the operating system. The one that does is the better option. Also you can compare the operating systems. A copy of the original can be easily identifie by just looking at it. Check online to find out. I recommend that you buy the expensive one just to be sure.