Hey Karioca, also from my side congratulations.
If you are asking whether to go to Doha or to stay in Moscow, I can only speak for myself. I would go to Doha.
Qatar Airways might sure be a good horse to bet on. The other side might be Doha to live with. And the local culture(s). And the climate. And the everyday aspects which might not be logical than rather much more random.
But once you learn to live with it, you even might start to like it. The middle east is very different from any other kind of place on earth. It can be a very good choice, and it can also be the least favourable place you want to be, depending on what you make of it (if you have a family that has different opinions about your decisions for instance, or if you cant cope with the climate/culture/lifestyle whatever...)
Good luck with your decisions and I hope to meet you soon in Doha
