I would choose Sitka Spruce for a milled shaft. So damn tough, and I have battered them for years now! Stump shooting is my favorite activity and it really puts your arrow builds through their paces. Second would be Doug fir.
For a natural shoot shafts I like Oceanspray first, followed by Red osier and Nootka rose. Ocean spray is incredibly strong. I have intentionally shot it into a big rock with a high 50’s osage bow and it just bounced back hard and was just as good as it was when I shot it. The brass pistol cases was pretty mangled but the shaft was perfect! Osier is maybe not quite as tough as OS, but darn close, and it grows in more places in NA, and imo grows a little straighter. Nootka rose, if you find a good patch, will yield loads of beautiful shoots. However they grow nasty thorns, which makes harvesting more difficult, plus everywhere the thorns grow the shafts has a little wiggle. A little painful to straighten.