Hi fellow Flyers

First of all, I do want to mention that I have tried searching through this forum for answers to no success.

Situation:
I have just completed several flights on LAN airlines and would want to credit the miles to a oneWorld program. I know that LAN have their own program called the LANPASS but I have reservations in crediting the miles to that program as I would probably not travel much on LAN unless I am in the South America region.

I am considering going for CX's program but I am not sure if that is the best route to go for and would like to seek advise.

Background info
1. Home airport --> SIN/CGK (I spend most of the year in between this two places) In the next few years, I might return to the US
2. How many miles a year? --> between 15-20k, can reach 30K.
3. types of fares? --> economy mostly (sometimes discounted). business class once every 2 years or so (though I would aim to at least do 1 business class annually)
4. Can choose airlines mostly (but recently most of my travel are on SQ or CX), travel for both work and pleasure
5. Region of travel --> mostly Asia. 1 trip each to Australia and the US
annually
6. FPP Status? --> Right now only a regular KF because of the limited mileage credited as result of discounted tickets. Also regular on Emirates
7. Whats important in a FPP? --> redemption, upgrades, award access, lounge access (in order)
8. Preferred airlines? SQ, CX (mostly, but I also like TG, NH, EK) --< have more experience in *A airlines mostly cause of my travel pattern

Thanks in advance. Hoping to hear from the esteemed experts soon.