HI Maestro,
Welcome to the (as yet) very sparsely-populated flight-simulation enthusiast corner of the forum!
Those screenshots look awesome!
So, what is it that you value most in a flight simulator? Is it the imagery, or is it the flight models? If it's the former, I would definitely recommend GMAX's addons, they seem to have very good visuals, pyrotechnics and damage effects. The reviews of the flight models are also very positive, although they are somewhat debated and criticized by some enthusiasts on forums.
If you prefer realism above all else, then you're a hard-core simmer, which means that you should probably look away from microsoft's products. I would recommend you to buy the budget release of "Rowan's Battle of Britain" (see the 'CFS 1' thread for info), or its full-price sequel ( I think it's called "Wings of Fury").
But if you want to stay with microsoft, because of its extendability and tweak potential, I can't see anything wrong with GMAX's products, but since I haven't flown them, I really can't provide a lot more information.
Whatever the choice, I wish you a happy virtual flight.
Best Regards