Avios? Asia Miles?
 

I have about 75000 points in Asia Miles and Silver status. I also have 50,000 points in AMEX. I know the transfer rate to Avios is 1:1 and to ASia Miles is 1:1.25.

If I want to travel from Shanghai to Toronto business/first class, what would be the best way to use the points?

My transfer rates for MR to AM is one-to-one in the US...?

Anyways if you want to book travel, you have to move the points to one platform.

That said, I think you only need like 85,000 AM to book from PVG-YYZ one-way.

Canadian Amex? But even that's 1 MR:1 Avios or 1,000 MR:750 AM.

Assuming you want to fly CX, AM requires 145k for roundtrip in J (OW is 85k).
AVIOS requires 330k (OW: 115k). I guess in any event AM is the better deal.

Can you get AAmiles? 110k for J, 135k for F (halve for OW).

Whoops. I made a mistake - it's not 1:1.25. Yeah- I have Canadian AMEX. I don't have access to AA points. We don't have as many options :(

193.33K MR for R/T with AM vs 330K MR for Avios

Well if you transfer to AM, you would have 112,500 AM. I think you're allowed to buy the difference.

Another way is to sign up for a credit card that gets you more MR points you can then convert to AM.

While it won't help the OP with his current trip, ba points are generally much more useful than Asia Miles if you redeem regional awards in economy.

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Regional economy w simple routings.