Personally if I had to switch, I would switch to SPG at this point. Marriott of late does not seem to care for its loyal members. With SPG gold, you should get junior suites upgrades every now and then and they actually have promotions. They give a 500 point online booking bonus. Lately, Marriott has had no promotions. They did have a free weekends one, but I could care less for one of those. Who wants to spend another night at a hotel when you spend almsot 200 a year already? What you will get with Marriott is consistensy. But after a while this gets really old. In regards to the FUSA card, I switched my UA FUSA card to MR. They did it with no problem. But you would not get the 10K point sign-up bonus that way. So if you want that, then apply for a MR FUSA card and cancel the other or maybe you can sweet-talk a customer service agent into giving you the points for the switch. A big advantage with Marriott is that there are almost everwhere. From high-end properties to the likes of Fairfield Inns off freeways. Maybe I am biased because I switched from Marriott to SPG myself.