It should be noted that the $10FB cert is for domestic properties. Int'ly they still do an amenity (wine, cheese, cracker, etc) for Plat arrival gift.
Is there a huge dif btwn Gold & Plat? No. I've found upgrades (int'ly at least) seem to be better w/ Plat, there's the 50% bonus points, ability to get room if fully booked, make Plat worth it.
I guess the question for the OP is, will s/he be able to qualify for Plat next year? If not, s/he might want to stick w/ Gold & get the roll-over.
Cheers.