Actually KL Plat is the answer - too bad you can't add to your current status.
For *A flights, ajinlondon is correct - go with LH.
Check out this thread which answered some of my own questions concerning the same subject earlier this year:
http://www.flyertalk.com/forum/Forum1/HTML/009381.html
I chose LH.
Note that LH miles expire after 3 years unless you're elite of have LH credit card.