Right now, you can score a 50% transfer bonus when you transfer your hotel points to Asia miles. This promotion is valid through the end of January, 2019. Unfortunately, the 50% bonus does not apply to Marriott or Starwood. You can see all the details of the offer here.
50% Transfer Bonus To Asia Miles
# The 50% Bonus Miles offer does not apply to Starwood Preferred Guest and Marriott Rewards® programmes. You will earn regular Miles by converting your points from these hotel loyalty programmes.
It’s a bummer that Starwood and Marriott are not included in this promotion, but if you have a specific redemption in mind check this out.