Asia and Africa is rather hard to reach with SK.

Next question is on what do you want to spend your miles? If its for flights to see Grandma in the Nordics, EB points are great value. If its to the US, EB has its merits on SK operated flights, but they are hard to get in popular times, you have more opportunities with M&M. CPH to Europe is also possible with EB, on M&M award availability is great, but you have to pay a lot of surcharges.