Finish dwarven area or elves?

[Namel]

I have sealed the deal with dwarves and done some clearing of areas at dwarves but I seem to be finding more and more areas there. When I returned with deal to king it asked me to go to elf lands.

Now I am wondering what is "right" (easiest) order to do stuff? Should I clear areas at dwarves I haven't yet explored, underground sea and where train goes (and possible areas where I can get for those two places)? Or should I go after elves?