QUOTE(kinabalu @ Oct 14 2015, 03:08 PM)
Dear Sifus,
I travel to Newark Liberty international airport from KLIA once or twice every year.
So far the choices I have is with BA (EWR - LHR - KUL) and cathay (EWR - HKG - KUL)
At the moment I am spoil with FF choices and cannot decide which one suits me the most.
Please advise among Enrich/Asiamiles/AAdvantage, which one is the most suitable for me?

Have to agree with the flyertalk part, go read up and understand the pros and cons there. Far more experience there compared to what we can provide here, plus you get to firm up your objective once you have a lot more info/knowledge.
Best case scenario where you're flying economy class and can get 100% miles back is KUL-LHR-EWR/JFK at around 20k miles per trip or say 40k miles per year.
Assuming you're flying out of KUL:
* 40k miles on AAdvantage is a one way trip to North America or Europe.
* 40k miles on Avios is about 8 one-ways to SGN/PNH/HKT/KBV or about 5 one-ways to BKK/RGN/CGK/REP
An alternative is to fly KUL to EWR/JFK on a Star Alliance airline eg. Turkish or Singapore and register for United MileagePlus.
Also assuming out of KUL
* 40k miles on MileagePlus is a one-way to North America
* 40k miles on MileagePlus is 2 one-ways to AKL/SYD/MEL/PER
Overall the answer is it depends on what your objective is.
Good luck