Checking a bookmaker's Special Markets is like paying a closer look in what can really offer to its customers. Many punters prefer to bet on how many goals will be scored, the number of cards, corners or the time the first/last goal will be scored etc. So the bookmaker of your choice should be the one that comforts you and your betting habits. And of course, has Asian Handicaps.
The first thing you should pay attention to is the number of choices you can have. Secondly, the odds of those choices. They must be highly competitive. Finally, the Special Markets should be given in a very simple and not confusing way. The general idea is to find the safest way to win the bookie and not get troubled.