There are 2 Asian Sportbooks which clearly stand out.

188Bet and 12Bet are exceptional sportsbooks and the best Asian Handicap odds anywhere can often be found at these sportbooks. They have an exceptional saftey rating.
Both sportsbooks are amongst the best in the world for football and often have the best Asian handicap lines anywhere.

These two sportsbooks are independant and have different lines. They are very similar in other respects and it is impossible to separate the two of them in terms of quality. It will come down to the look and feel of the site and the bonus rollover conditions to determine which one is better for you.

Safety:
Both of these sportsbooks have impeccable track records with regards to safety of players funds.

Withdrawal Speed:
188Bet and 12Bet have rapid withdrawals - amogst the fastest in the business. 12Bet is probably the fastest in the business.

Bonuses:
188Bet offers a 30% bonus up to a maximum of £100 (or equivalent currency) with a 10X time rollover.
12Bet offers a 20% bonus up to 150£ (or currency equivalent) with a 10X time rollover.

Live Betting:
Both are leaders in the field - the best sportsbooks anywhere for live betting.

Odds:
Competitive odds with low juice. 188Bet usually has slightly better lines. 1.94 V 1.93 for NBA. 1.93 V 1.92 for NFL. Both are 1.97 or better for football.

Asian Handicaps:
Both these sportsbooks are consistently amongst the best Asian Handicappers. Between the two of them you will usually find a line better than Pinnacle.
188Bet has a slightly better vig at 1.975 lines for Asian handicapping.
12Bet has 1.97 lines for Asian handicapping.

Customer Service: Both are very good.

Location: 12Bet: Phillipines 188Bet: Isle of Man

Website and betting platform:
Both have a unique Asian format which works very well once you get accustomed to it.

Currencies:

	188BET	12BET
Great Britain Pounds (GBP)	Yes	Yes
Euros (EUR)	Yes	Yes
US Dollars (USD)	Yes	Yes
Malaysian Ringgit (MYR)	Yes	Yes
Chinese Renminbi (RMB)	Yes	Yes
Thailand Baht (THB)	Yes	Yes
Indonesia Rupiah (IDR)	Yes	Yes
Hong Kong Dollar (HKD)	Yes	X
Singapore Dollar (SGD)	Yes	X
Swiss Franc (CHF)	X	Yes
Australian Dollar (AUD)	X	Yes

Limits:
Both allow betting from 1 currency unit. 188Bet limits are in the thoudands.
12Bet limits typically around $300/bet but this may change.