Moving to Canada! Which Star Alliance would you recommend?

Well... the much lower threshold required for AC*G for one thing...

Also you get more 'home carrier' benefits as an AC E on AC, than as a KF EG on SQ, such as upgrade vouchers. The latter only gets you a mileage bonus besides the general *G benefits. There was some devaluation of AC E benefits earlier this year though so you might want to do some research on that one. Otherwise the alliance-wide *G benefits are identical.

KF miles expire after 3 years. AC miles remain in your account so long as there's activity at least every 12 months - but expire after 7 years from date of accrual.

If you've got Skyteam/ oneworld status (AA Gold works... or anything that looks Gold), you might want to attempt a status match to bmi diamond club. You will then only need 38K to retain BD*G. bmi has a very generous earn/burn ratio with very high accrual rates for premium cabin travel, as well as an awesome value Cash and Miles program.

 

AC service is fine, and living in Canada you're more likely of op-ups etc for AC than SIA. Don't forget AC has a reasonable network of flights to the Carribean, Central America etc for using miles/ certs on leisurely jaunts .