Thank's loc22550 for your reply I really appreciate every single word you wrote
It all depends of your personnal ambition..(building experience on different type&flying more destinations (QR) or taking an upgrade as soon as you can (Fly Dubai?),Depends as well where do you want to live...Dubai or Doha...Not really the same!
For me I prefer building experience on a different type and flying new destinations rather than a quick upgrade,however, still there is one thing that I have carefully think about, which is that I have many friends and relatives in Dubai and Abu Dhabi
and very few friends at Doha