KrisFlyer versus United FF

[BondiMan]

I a not currently a KrisFlyer member built have a United Mileage Plus membership with about 150,000 mile. I have booked a Business Class SQ return flight syd-Zurich at end of year. I am unsure whether to sign up for A KrisFlyer or just use the United miles via Star Alliance to earn points? Any help would be greatly appreciated?
Thanks

 

[SYD]

Do you have or are you likely to get to any meaningful status with either? If not, you might be better off adding the points to your existing UA points - since they don't expire and are still generally useful there.

You'll possibly earn more redeemable SQ points but that have a hard expiry after 3 yrs (use it or lose it). Which is the main downside to SQ for the occasional points earner.