RE: what is your opinion and why?
I chose the Bushnell. I find they have slightly better optics for the dollar spent, but not a huge difference. Nikon at the same price is in the same class or better.
I think the best would be a Sightron. Sightron tends to have very good color rendition to my eye. Leupold is the worst, of the better brands. Color rendition, brightness and clarity of focus arethe keys to resolution IMO.
I'm sorry, but I'm not sure what $300 Canadian buys exactly.