is "the best area" to live in my opinion.   Traffic here is horrible so you want to be close to those places or you will waste a lot of your day stuck in jams.   

Old airport--close to airport/ good shopping  but horrible traffic at all times of the day

Al Sadd-- middle of town/ good shopping, but again bad traffic jams

Are you looking for a happening part of town, or peace and quiet?   your "best area"  depends a lot on what you are looking for.