Another thing I'd note is that Greenland has little choice in their start. If they want to match the other two powers with 2 first year builds (which, in a 3 player map, giving up an early build is a dangerous gambit), then they have to take BAFF and NEW. They have no other options. Sure they could try to gain positioning by moving to North Atlantic Ocean or West Arctic/Arctic Arch, but neither of those gives a major advantage, and almost always I suspect greenland will take the 2 SCs. Perhaps an island chain from Western Greenland to Elle to Victoria would allow Greenland some flexibility to choose a direction?
The person with the most options is really Mexico. They have 4 SCs to choose from (Cuba, South East, Great Lakes, and Rocky Mountains), 3 of which no one can contest (Great Lakes, South East, Cuba), and the last one, if Alaska contests it, they willingly give up a build to do so (although so does Mexico).