Both are great framing materials. Spruce is less stiff than Douglas Fir , but available "locally" for you. You will have to use larger members and more of them but that is the fun of timberframing.
DF #2 Fb 875 Fv 85 E 1,300,000
S #2 Fb 600 Fv 65 E 1,000,000
Values from NDS '97
Bake