Which texture pack to install ?

I just downloaded "Airports Environment Upgrade Ver 7" from avsim library. I was about to install it when I realized I had "Reality pack" (another texture pack) installed. I am assuming the AEUv7 would over-write many of the textures from the Reality Pack. Anyone have any idea which is a better texture pack? That is, should I go ahead and install the AEUv7 pack? Also, there is another texture pack called "Real Environment 2006". I have that downloaded as well, but not sure if I should install it. Any guidance here ? Thanks