Dave Noble said:

Comparing against a trip SYD-LAX

Base miles is 14976

COS bonus AA PLT/EXP = 14976

COS bonus QF Gold = 7288

COS bonus QF Platinum = 14976

On 2 trips, mileage earned AA = 59,904 : QF Gold = 44,528 ; QF Platinum = 59,904

To compare additional CC spend needed to get an award to LAX in Y or J

For Y

Using AA, the number of points needed from AMEX debt cards = 15,096 => $36597

Using QF Gold, the number of points needed from AMEX debt cards = 51,472=> $51,472

Using QF Platinum, the number of points needed from AMEX debt cards = 36,096 => $36,096

For J

Using AA, the number of points needed from AMEX debt cards = 65,096 => $157,808

Using QF Gold, the number of points needed from AMEX debt cards = 147,472 => $147,472

Using QF Platinum, the number of points needed from AMEX debt cards = 132,096 => $132,096

Being zonal based, LAX is not one of the locations that comes out particularly well for AA since it is a close destination. If travellling further into the US on the award flight, AA comes out better since the same number of points will get to JFK whilst using QF points it would need as many as to get to London

Dave

Comparing against trip SYD-SIN

Base miles is 7816

COS bonus AA PLT/EXP = 7816

COS bonus QF Gold = 3908

COS bonus QF Platinum = 7816

On 2 trips, mileage earned AA = 31,264 ; QF Gold = 23,448 ; QF Platinum = 31,264

To compare additional CC spend needed to get an award to SIN in Y or J

In Y using AA, the number of points needed from AMEX MR points = 18,736 => $45,421

In Y using QF Gold, the number of points needed from AMEX MR points = 36,552 => $36,552

In Y using QF Platinum, the number of points needed from AMEX MR points = 28,736 => $28,736

In J using AA, the number of points needed from AMEX MR points = 38,736 => $93,906

In J using QF Gold, the number of points needed from AMEX MR points = 96,552 => $96,552

In J using QF Platinum, the number of points needed from AMEX MR points = 88,736 => $88,736

You decide whether AA looks adventageous in this example!

Comparing against trip PER-SIN

Base miles is 4858

COS bonus AA PLT/EXP = 4858

COS bonus QF Gold = 2429

COS bonus QF Platinum = 4858

On 2 trips, mileage earned AA = 19,432 ; QF Gold = 14,574 ; QF Platinum = 19,432

To compare additional CC spend needed to get an award to SIN in Y or J

In Y using AA, the number of points needed from AMEX MR points = 30,568 => $74,105

In Y using QF Gold, the number of points needed from AMEX MR points = 35,426 => $35,426

In Y using QF Platinum, the number of points needed from AMEX MR points = 30,568 => $30,568

In J using AA, the number of points needed from AMEX MR points = 50,568 => $122,590

In J using QF Gold, the number of points needed from AMEX MR points = 85,426 => $85,426

In J using QF Platinum, the number of points needed from AMEX MR points = 80,568 => $80,568

Clearly AA is no longer an option!

As usual YMMV!