I currently have all four credit cards:
1) MR Personal Visa
2) MR Business Visa
3) SPG Amex Personal
4) SPG Amex Business
Since the 15 night annual bonus seems to be limited to one per account, I am wondering which card to keep, and which ones to cancel. Would appreciate suggestions based on the information available so far.
I'm looking for this info too, although I only carry the personal cards. As another poster pointed out, it seems strange to merge the program but keep separately-branded cards. And since I'm no longer allowed by company policy to use personal cards for business travel, it doesn't seem worth it to keep paying the annual fee on the SPG Amex if I can't gain any additional nights credit beyond what the Marriott Visa will give.