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So, in this case, 270,000 Marriott points are approximately equivalent to 100,000 SPG points. With SPG, you get 5,000 more miles, but with Marriott you get a 7 night stay. If we ignore the differences, we can say that we would need 2.7 Marriott points per SPG point in order to break even.
If we learn that Marriott plans to convert SPG points to Marriott points, and if we learn the conversion ratio in advance, then: 1  If the ratio is less than 1 to 3: Use or convert your SPG points before the conversion. 2  If the ratio is 1 to 3: Carefully consider Marriott Vacation packages as an alternative to converting SPG points to miles.