I did my H1B stamping in canada. I was there for 1.5 months. I gave interview 2 times. Now I think it would have been better if I had gone to Nepal. It felt like it makes no difference whether you go to Canada or Nepal.
But the good thing about going to Canada was that I got to see new place and I was able to work while I was there.
And I hate Canada for its brutal winter :)