Just wondering if some faithful SPG folks could sell me on moving from Marriott. I am a Plat Marriott who will spend about 150-175 nights annually in hotels for business. I do have an SPG account from a 3-night conference stay earlier in the year. With Delta (who I fly with most frequently) teaming up with SPG on points, I wondered if the switch would be most worthwhile. Can anybody who has experience with both lay out the pros and cons for me? Thanks in advance.