Originally Posted by margarita girl

Hmm, US$100 Marriott spend on US Amex gets you 600 pts (6 pts/$). US$100 spend on Cdn card means C$133 + 3% forex fee = C$137 X 5 pts/$ = 685 pts!

On non Marriott spend, both cards get 2 pts/$, so US$100 would give 200 pts and C$137 would give 274 pts.