I wear a 10 in northwaves. Again, my left foot felt fine but my right foot where I had the surgery was too tight by the toes. I would've been fine if I didn't have surgery on my foot. I wear 10 in sneakers.
So the snowboard boots in 10 are tight? For me, burtons fit more snug for me so I never had a pair of those. I would probably need a 10.5 in burtons.