I was in Dubai for only 14 hours but this I’m certain of: the Burj Khalifa is really, really tall. The difference in sunset time between its base and pinnacle is no less than 3 minutes. And with an elevator that moves 10 meters per second (22 mph), it is technically possible to watch the sun disappear twice in one sitting.
Main difference between Dubai and Abu Dhabi: Abu Dhabi’s development has been fueled primarily by massive government investment in all areas, money obtained from selling oil. Dubai, in contrast having very little oil, has invested only in infrastructure, including building the biggest seaport in the Arab world, and has allowed foreigners to be sole proprietors of any business they might wish to start. There are still random blocks of sand on the grid, but Dubai itself feels more like a true city, and much more ex-pat friendly, than Abu Dhabi (for now). I cannot make any other judgements, because the long strip of vain urbanity (or urban vanity) goes on and on and I didn’t have nearly enough time to pull my eyes away from the Burj Khalifa and still get a good night’s sleep before my flight to Kathmandu.