Quick question needing some member feedback.

I need to buy AA miles by end of week, the 200k miles sells at USD$4180. I have already place F award on hold so this should be worth it. Now, I'm debating what card to use to buy it. The currency is about CAD$5580

I have Marriott VISA so that gives 11520 Marriott points (Edit: I think the chase card will consider this as airline too, so 2x points)
I also have Amazon VISA with 1% cashback, so that's CAD$55.8 rebate

Alternatively, AA.com mile purchase is considered as airline purchase so AMEX Gold card will give 2x miles, but AMEX has a 2.5% conversion fee. The total will then be CAD$5760.

So for CAD$180 extra I can get 11520 Aeroplan miles or BA Avios or 5760 SPG points.

Thoughts on what the best method to buy?