I live northwest of you. By 8 hours. So it gets super cold up here. Going with the foam is more expensive, but in the hear savings it pays for itself in 5 years. So, if you're going to live there for more than 5 years, get the foam. If you're planning to live there less than that, get the blown.

In both cases, go with the ceiling insulation, not the rafters. The rafters won't give you enough thickness, and you'll need an air chute the entire length of the rafter, to prevent ice dams. You might have venting issues because of the way roofs were constructed back then with the center spine acting as a venting block.