The beer I drink most often is Guinness, even though its never like having one in Ireland.
Second most often is Blue Buck by Phillips Brewing here on Vancouver Island. It's an amber beer with a really nice finish. I drink it for two reasons:
1. Like the other local beers, it's fresh. Fresh beer tastes better.
2. Phillips sponsors many events in town, some of which I participate in, so they support me and thus I support them.
My FAVOURITE beer, however, is Mackeson Triple Stout. I don't pretend to be a beer connoisseur but that's my favourite. I also enjoy Samuel Smith's Oatmeal Stout (both are a bit hard to find round here, or quite expensive, but worth it!).
I remember having some Samuel Smith Pale Ale in Boston and realising how much better it is when you can get it fresh. Even since then, however, I can't stand it ... because I'm not in Boston.