wich one to get between ML 350 and FX35

[jonafre]

Hello everyone,
I am an owner of a BMW X5 2005 and want to change and get a slightly more powerful one. I am thinking about the Fx35 2008. I love it, love the sound, the look. I recently saw the ML350 2008 with a friend, I liked it. I loved the inside look more, and I am an older owner of a benz (CLK) with no problem (not like the X5). This two cars are my last 2 choises, as they fit in my budget (used but saw each of them in the used cars section of each specific dealer).
I drive them on a basis of 50% of the time on highways and mountains and 50% in stop and go traffic. I want to know if is there anyone of you who owned both or tested both or know anything about them. Every advice is needed and welcomed.
I also need to know between this two cars who has the best fuel consumption ? because on the internet I see that they have the same fuel consumption but in the market the dealers say no. and comparing to my X5 , does anyone know how will be the fuel consumption with the new cars ? the maintenance cost ? reliability ? etc.
I am lost now, I really don't know what to choose.
Thank you

[jonafre]

No one to help ?