Well this question is addressed each year at the Canadian Brewing Awards but today was asked by a local radio station
I think the growth of craft beer had made this much harder to answer these days.
Is it 'best' by most sold in a year? 'Best' regionally? 'Best' by style? I think it's this last one that you have to go by as so many beers are so different from one another. If you are pilsner drinker than you probably wouldn't vote for a Russian imperial or a barley wine but it doesn't mean they're not great - or even the best.
Try beers out of your comfort zones. Your world will vastly expand.
Oh what are our thoughts?
Tough but:
ESB - Propellar
Stout - Wildrose Alberta Crude
IPA - mad Tom from Muskoka
Lager - liking Big Surf right now
This may take some time