for fast processing , its hard to predict it seems that all offices are so busy , but you will get your interview faster if you live in the same city of the asylum office, and there are 8 asylum offices in the US .
regarding chances of getting approved , you have to remember that your case and preparation would determine your chanced of approval , however and based on statistics the best location on the asylum office level is San Francisco and the worst is NewYork , on the immigration court level the best is Newyork .