On the website, the upgrade policy for Gold members is:

"When you check in, we'll upgrade your room whenever we can at no additional charge. Not available at Marriott Vacation Club International locations."

For Plat. members the upgrade policy is:

"When you check in, we'll upgrade you to our finest available accommodations - whenever we can - at no additional charge. Not available at Marriott Vacation Club International locations."

There is a distinction in the wording, is there one in practice?

I made Gold this month... Now I am deciding whether or not I should push for Plat. before the end of March.