No worries about your English, we can read it.
🙂 I moved this thread to the appropriate section of the forum, no problems there. Sorry I didn't answer this earlier. I saw it two days ago, but was too busy at the time to answer.
😞Any of them would be fine, the major difference is the HDD or the amount of RAM. Considering that both of those things are easily upgradeable on the G750, I would recommend going with the cheapest one and upgrading everything yourself if you need to.
Better ROG laptops, probably not. Key thing is screen size. If you like the 17" screen size, then these are fine. If you like 15", then G55 is the way to go.