i am a member of royal orchard plus (Thai air) & Krysflyer (singapore Air). which is the best frequent flyer program of these two, to transfer points to.
Jadeqld
Where are you transferring points from? I am aware that Amex Membership Rewards allows transfer of points to both KF & ROP. However the transfer rates are 1:1 for Krisflyer and 4:3 for Royal Orchid Plus, and then for star alliance rewards the rates ex-AUS are higher on Royal Orchid Plus (without multiplying by 4/3), so really it doesn't make a lot of sense.
ex-AU, star alliance awards
SE Asia - 55K (KF), 70K (ROP = 93K MR points)
HKG/Taipei- 60K (KF), 70K (ROP)
Japan/CHina- 80K (KF), 90K (ROP)
Europe - 100K (KF), 130K (ROP)
US - 80k (KF), 100K (ROP)
The Thai only awards using ROP are more competive (very similar to Krisflyer's Singapore AIrlines only awards), but KF offer a 15% discount for booking online.